Upgrade blevesearch to v0.8.1 (#9177)

For #1441 a91b427b59
2025-10-31 21:28:11 +09:00 · 2019-11-27 17:23:33 +08:00
parent b50dee5a61
commit 9591185c8f
180 changed files with 43400 additions and 41105 deletions
--- a/vendor/github.com/blevesearch/bleve/.travis.yml
+++ b/vendor/github.com/blevesearch/bleve/.travis.yml
@@ -3,9 +3,9 @@ sudo: false
 language: go

 go:
- - "1.9.x"
 - "1.10.x"
 - "1.11.x"
+ - "1.12.x"

 script:
  - go get golang.org/x/tools/cmd/cover
@@ -15,7 +15,12 @@ script:
  - gvt restore
  - go test -race -v $(go list ./... | grep -v vendor/)
  - go vet $(go list ./... | grep -v vendor/)
-  - errcheck -ignorepkg fmt $(go list ./... | grep -v vendor/)
+  - go test ./test -v -indexType scorch
+  - if [[ ${TRAVIS_GO_VERSION} =~ ^1\.10 ]]; then
+        echo "errcheck skipped for go version" $TRAVIS_GO_VERSION;
+    else
+        errcheck -ignorepkg fmt $(go list ./... | grep -v vendor/);
+    fi
  - docs/project-code-coverage.sh
  - docs/build_children.sh

--- a/vendor/github.com/blevesearch/bleve/document/field_text.go
+++ b/vendor/github.com/blevesearch/bleve/document/field_text.go
@@ -86,6 +86,10 @@ func (t *TextField) Analyze() (int, analysis.TokenFrequencies) {
 	return fieldLength, tokenFreqs
 }

+func (t *TextField) Analyzer() *analysis.Analyzer {
+	return t.analyzer
+}
+
 func (t *TextField) Value() []byte {
 	return t.value
 }
--- a/vendor/github.com/blevesearch/bleve/geo/geo.go
+++ b/vendor/github.com/blevesearch/bleve/geo/geo.go
@@ -37,6 +37,12 @@ var geoTolerance = 1E-6
 var lonScale = float64((uint64(0x1)<<GeoBits)-1) / 360.0
 var latScale = float64((uint64(0x1)<<GeoBits)-1) / 180.0

+// Point represents a geo point.
+type Point struct {
+	Lon float64
+	Lat float64
+}
+
 // MortonHash computes the morton hash value for the provided geo point
 // This point is ordered as lon, lat.
 func MortonHash(lon, lat float64) uint64 {
@@ -168,3 +174,35 @@ func checkLongitude(longitude float64) error {
 	}
 	return nil
 }
+
+func BoundingRectangleForPolygon(polygon []Point) (
+	float64, float64, float64, float64, error) {
+	err := checkLongitude(polygon[0].Lon)
+	if err != nil {
+		return 0, 0, 0, 0, err
+	}
+	err = checkLatitude(polygon[0].Lat)
+	if err != nil {
+		return 0, 0, 0, 0, err
+	}
+	maxY, minY := polygon[0].Lat, polygon[0].Lat
+	maxX, minX := polygon[0].Lon, polygon[0].Lon
+	for i := 1; i < len(polygon); i++ {
+		err := checkLongitude(polygon[i].Lon)
+		if err != nil {
+			return 0, 0, 0, 0, err
+		}
+		err = checkLatitude(polygon[i].Lat)
+		if err != nil {
+			return 0, 0, 0, 0, err
+		}
+
+		maxY = math.Max(maxY, polygon[i].Lat)
+		minY = math.Min(minY, polygon[i].Lat)
+
+		maxX = math.Max(maxX, polygon[i].Lon)
+		minX = math.Min(minX, polygon[i].Lon)
+	}
+
+	return minX, maxY, maxX, minY, nil
+}
--- a/vendor/github.com/blevesearch/bleve/geo/geohash.go
+++ b/vendor/github.com/blevesearch/bleve/geo/geohash.go
@@ -1,32 +1,21 @@
-// The code here was obtained from:
-//   https://github.com/mmcloughlin/geohash
-
-// The MIT License (MIT)
-// Copyright (c) 2015 Michael McLoughlin
-// Permission is hereby granted, free of charge, to any person obtaining a copy
-// of this software and associated documentation files (the "Software"), to deal
-// in the Software without restriction, including without limitation the rights
-// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
-// copies of the Software, and to permit persons to whom the Software is
-// furnished to do so, subject to the following conditions:
-
-// The above copyright notice and this permission notice shall be included in all
-// copies or substantial portions of the Software.
-
-// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
-// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
-// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
-// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
-// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
-// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
-// SOFTWARE.
+//  Copyright (c) 2019 Couchbase, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 		http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+// This implementation is inspired from the geohash-js
+// ref: https://github.com/davetroy/geohash-js

 package geo

-import (
-	"math"
-)
-
 // encoding encapsulates an encoding defined by a given base32 alphabet.
 type encoding struct {
 	enc string
@@ -47,128 +36,76 @@ func newEncoding(encoder string) *encoding {
 	return e
 }

-// Decode string into bits of a 64-bit word. The string s may be at most 12
-// characters.
-func (e *encoding) decode(s string) uint64 {
-	x := uint64(0)
-	for i := 0; i < len(s); i++ {
-		x = (x << 5) | uint64(e.dec[s[i]])
-	}
-	return x
-}
-
-// Encode bits of 64-bit word into a string.
-func (e *encoding) encode(x uint64) string {
-	b := [12]byte{}
-	for i := 0; i < 12; i++ {
-		b[11-i] = e.enc[x&0x1f]
-		x >>= 5
-	}
-	return string(b[:])
-}
-
-// Base32Encoding with the Geohash alphabet.
+// base32encoding with the Geohash alphabet.
 var base32encoding = newEncoding("0123456789bcdefghjkmnpqrstuvwxyz")

-// BoundingBox returns the region encoded by the given string geohash.
-func geoBoundingBox(hash string) geoBox {
-	bits := uint(5 * len(hash))
-	inthash := base32encoding.decode(hash)
-	return geoBoundingBoxIntWithPrecision(inthash, bits)
-}
+var masks = []uint64{16, 8, 4, 2, 1}

-// Box represents a rectangle in latitude/longitude space.
-type geoBox struct {
-	minLat float64
-	maxLat float64
-	minLng float64
-	maxLng float64
-}
+// DecodeGeoHash decodes the string geohash faster with
+// higher precision. This api is in experimental phase.
+func DecodeGeoHash(geoHash string) (float64, float64) {
+	even := true
+	lat := []float64{-90.0, 90.0}
+	lon := []float64{-180.0, 180.0}

-// Round returns a point inside the box, making an effort to round to minimal
-// precision.
-func (b geoBox) round() (lat, lng float64) {
-	x := maxDecimalPower(b.maxLat - b.minLat)
-	lat = math.Ceil(b.minLat/x) * x
-	x = maxDecimalPower(b.maxLng - b.minLng)
-	lng = math.Ceil(b.minLng/x) * x
-	return
-}
-
-// precalculated for performance
-var exp232 = math.Exp2(32)
-
-// errorWithPrecision returns the error range in latitude and longitude for in
-// integer geohash with bits of precision.
-func errorWithPrecision(bits uint) (latErr, lngErr float64) {
-	b := int(bits)
-	latBits := b / 2
-	lngBits := b - latBits
-	latErr = math.Ldexp(180.0, -latBits)
-	lngErr = math.Ldexp(360.0, -lngBits)
-	return
-}
-
-// minDecimalPlaces returns the minimum number of decimal places such that
-// there must exist an number with that many places within any range of width
-// r. This is intended for returning minimal precision coordinates inside a
-// box.
-func maxDecimalPower(r float64) float64 {
-	m := int(math.Floor(math.Log10(r)))
-	return math.Pow10(m)
-}
-
-// Encode the position of x within the range -r to +r as a 32-bit integer.
-func encodeRange(x, r float64) uint32 {
-	p := (x + r) / (2 * r)
-	return uint32(p * exp232)
-}
-
-// Decode the 32-bit range encoding X back to a value in the range -r to +r.
-func decodeRange(X uint32, r float64) float64 {
-	p := float64(X) / exp232
-	x := 2*r*p - r
-	return x
-}
-
-// Squash the even bitlevels of X into a 32-bit word. Odd bitlevels of X are
-// ignored, and may take any value.
-func squash(X uint64) uint32 {
-	X &= 0x5555555555555555
-	X = (X | (X >> 1)) & 0x3333333333333333
-	X = (X | (X >> 2)) & 0x0f0f0f0f0f0f0f0f
-	X = (X | (X >> 4)) & 0x00ff00ff00ff00ff
-	X = (X | (X >> 8)) & 0x0000ffff0000ffff
-	X = (X | (X >> 16)) & 0x00000000ffffffff
-	return uint32(X)
-}
-
-// Deinterleave the bits of X into 32-bit words containing the even and odd
-// bitlevels of X, respectively.
-func deinterleave(X uint64) (uint32, uint32) {
-	return squash(X), squash(X >> 1)
-}
-
-// BoundingBoxIntWithPrecision returns the region encoded by the integer
-// geohash with the specified precision.
-func geoBoundingBoxIntWithPrecision(hash uint64, bits uint) geoBox {
-	fullHash := hash << (64 - bits)
-	latInt, lngInt := deinterleave(fullHash)
-	lat := decodeRange(latInt, 90)
-	lng := decodeRange(lngInt, 180)
-	latErr, lngErr := errorWithPrecision(bits)
-	return geoBox{
-		minLat: lat,
-		maxLat: lat + latErr,
-		minLng: lng,
-		maxLng: lng + lngErr,
+	for i := 0; i < len(geoHash); i++ {
+		cd := uint64(base32encoding.dec[geoHash[i]])
+		for j := 0; j < 5; j++ {
+			if even {
+				if cd&masks[j] > 0 {
+					lon[0] = (lon[0] + lon[1]) / 2
+				} else {
+					lon[1] = (lon[0] + lon[1]) / 2
+				}
+			} else {
+				if cd&masks[j] > 0 {
+					lat[0] = (lat[0] + lat[1]) / 2
+				} else {
+					lat[1] = (lat[0] + lat[1]) / 2
+				}
+			}
+			even = !even
+		}
 	}
+
+	return (lat[0] + lat[1]) / 2, (lon[0] + lon[1]) / 2
 }

-// ----------------------------------------------------------------------
+func EncodeGeoHash(lat, lon float64) string {
+	even := true
+	lats := []float64{-90.0, 90.0}
+	lons := []float64{-180.0, 180.0}
+	precision := 12
+	var ch, bit uint64
+	var geoHash string

-// Decode the string geohash to a (lat, lng) point.
-func GeoHashDecode(hash string) (lat, lng float64) {
-	box := geoBoundingBox(hash)
-	return box.round()
+	for len(geoHash) < precision {
+		if even {
+			mid := (lons[0] + lons[1]) / 2
+			if lon > mid {
+				ch |= masks[bit]
+				lons[0] = mid
+			} else {
+				lons[1] = mid
+			}
+		} else {
+			mid := (lats[0] + lats[1]) / 2
+			if lat > mid {
+				ch |= masks[bit]
+				lats[0] = mid
+			} else {
+				lats[1] = mid
+			}
+		}
+		even = !even
+		if bit < 4 {
+			bit++
+		} else {
+			geoHash += string(base32encoding.enc[ch])
+			ch = 0
+			bit = 0
+		}
+	}
+
+	return geoHash
 }
--- a/vendor/github.com/blevesearch/bleve/geo/parse.go
+++ b/vendor/github.com/blevesearch/bleve/geo/parse.go
@@ -85,7 +85,7 @@ func ExtractGeoPoint(thing interface{}) (lon, lat float64, success bool) {
 			}
 		} else {
 			// geohash
-			lat, lon = GeoHashDecode(geoStr)
+			lat, lon = DecodeGeoHash(geoStr)
 			foundLat = true
 			foundLon = true
 		}
--- a/vendor/github.com/blevesearch/bleve/index.go
+++ b/vendor/github.com/blevesearch/bleve/index.go
@@ -117,6 +117,8 @@ func (b *Batch) String() string {
 // be re-used in the future.
 func (b *Batch) Reset() {
 	b.internal.Reset()
+	b.lastDocSize = 0
+	b.totalSize = 0
 }

 func (b *Batch) Merge(o *Batch) {
--- a/vendor/github.com/blevesearch/bleve/index/index.go
+++ b/vendor/github.com/blevesearch/bleve/index/index.go
@@ -121,6 +121,10 @@ type IndexReaderOnly interface {
 	FieldDictOnly(field string, onlyTerms [][]byte, includeCount bool) (FieldDict, error)
 }

+type IndexReaderContains interface {
+	FieldDictContains(field string) (FieldDictContains, error)
+}
+
 // FieldTerms contains the terms used by a document, keyed by field
 type FieldTerms map[string][]string

@@ -230,6 +234,10 @@ type FieldDict interface {
 	Close() error
 }

+type FieldDictContains interface {
+	Contains(key []byte) (bool, error)
+}
+
 // DocIDReader is the interface exposing enumeration of documents identifiers.
 // Close the reader to release associated resources.
 type DocIDReader interface {
--- a/vendor/github.com/blevesearch/bleve/index/scorch/introducer.go
+++ b/vendor/github.com/blevesearch/bleve/index/scorch/introducer.go
@@ -376,6 +376,7 @@ func (s *Scorch) introduceMerge(nextMerge *segmentMerge) {
 				fileSegments++
 			}
 		}
+
 	}

 	// before the newMerge introduction, need to clean the newly
@@ -392,7 +393,6 @@ func (s *Scorch) introduceMerge(nextMerge *segmentMerge) {
 			}
 		}
 	}
-
 	// In case where all the docs in the newly merged segment getting
 	// deleted by the time we reach here, can skip the introduction.
 	if nextMerge.new != nil &&
@@ -424,7 +424,6 @@ func (s *Scorch) introduceMerge(nextMerge *segmentMerge) {
 	newSnapshot.AddRef() // 1 ref for the nextMerge.notify response

 	newSnapshot.updateSize()
-
 	s.rootLock.Lock()
 	// swap in new index snapshot
 	newSnapshot.epoch = s.nextSnapshotEpoch
@@ -502,7 +501,6 @@ func (s *Scorch) revertToSnapshot(revertTo *snapshotReversion) error {
 	}

 	newSnapshot.updateSize()
-
 	// swap in new snapshot
 	rootPrev := s.root
 	s.root = newSnapshot
--- a/vendor/github.com/blevesearch/bleve/index/scorch/merge.go
+++ b/vendor/github.com/blevesearch/bleve/index/scorch/merge.go
@@ -18,6 +18,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"os"
+	"strings"
 	"sync/atomic"
 	"time"

@@ -151,13 +152,13 @@ func (s *Scorch) planMergeAtSnapshot(ourSnapshot *IndexSnapshot,
 		atomic.AddUint64(&s.stats.TotFileMergePlanNone, 1)
 		return nil
 	}
-
 	atomic.AddUint64(&s.stats.TotFileMergePlanOk, 1)

 	atomic.AddUint64(&s.stats.TotFileMergePlanTasks, uint64(len(resultMergePlan.Tasks)))

 	// process tasks in serial for now
 	var notifications []chan *IndexSnapshot
+	var filenames []string
 	for _, task := range resultMergePlan.Tasks {
 		if len(task.Segments) == 0 {
 			atomic.AddUint64(&s.stats.TotFileMergePlanTasksSegmentsEmpty, 1)
@@ -182,6 +183,12 @@ func (s *Scorch) planMergeAtSnapshot(ourSnapshot *IndexSnapshot,
 						segmentsToMerge = append(segmentsToMerge, zapSeg)
 						docsToDrop = append(docsToDrop, segSnapshot.deleted)
 					}
+					// track the files getting merged for unsetting the
+					// removal ineligibility. This helps to unflip files
+					// even with fast merger, slow persister work flows.
+					path := zapSeg.Path()
+					filenames = append(filenames,
+						strings.TrimPrefix(path, s.path+string(os.PathSeparator)))
 				}
 			}
 		}
@@ -221,6 +228,11 @@ func (s *Scorch) planMergeAtSnapshot(ourSnapshot *IndexSnapshot,
 				atomic.AddUint64(&s.stats.TotFileMergePlanTasksErr, 1)
 				return err
 			}
+			err = zap.ValidateMerge(segmentsToMerge, nil, docsToDrop, seg.(*zap.Segment))
+			if err != nil {
+				s.unmarkIneligibleForRemoval(filename)
+				return fmt.Errorf("merge validation failed: %v", err)
+			}
 			oldNewDocNums = make(map[uint64][]uint64)
 			for i, segNewDocNums := range newDocNums {
 				oldNewDocNums[task.Segments[i].Id()] = segNewDocNums
@@ -263,6 +275,13 @@ func (s *Scorch) planMergeAtSnapshot(ourSnapshot *IndexSnapshot,
 		}
 	}

+	// once all the newly merged segment introductions are done,
+	// its safe to unflip the removal ineligibility for the replaced
+	// older segments
+	for _, f := range filenames {
+		s.unmarkIneligibleForRemoval(f)
+	}
+
 	return nil
 }

@@ -311,6 +330,10 @@ func (s *Scorch) mergeSegmentBases(snapshot *IndexSnapshot,
 		atomic.AddUint64(&s.stats.TotMemMergeErr, 1)
 		return nil, 0, err
 	}
+	err = zap.ValidateMerge(nil, sbs, sbsDrops, seg.(*zap.Segment))
+	if err != nil {
+		return nil, 0, fmt.Errorf("in-memory merge validation failed: %v", err)
+	}

 	// update persisted stats
 	atomic.AddUint64(&s.stats.TotPersistedItems, seg.Count())
--- a/vendor/github.com/blevesearch/bleve/index/scorch/persister.go
+++ b/vendor/github.com/blevesearch/bleve/index/scorch/persister.go
@@ -90,6 +90,9 @@ func (s *Scorch) persisterLoop() {
 	var persistWatchers []*epochWatcher
 	var lastPersistedEpoch, lastMergedEpoch uint64
 	var ew *epochWatcher
+
+	var unpersistedCallbacks []index.BatchCallback
+
 	po, err := s.parsePersisterOptions()
 	if err != nil {
 		s.fireAsyncError(fmt.Errorf("persisterOptions json parsing err: %v", err))
@@ -111,7 +114,6 @@ OUTER:
 		if ew != nil && ew.epoch > lastMergedEpoch {
 			lastMergedEpoch = ew.epoch
 		}
-
 		lastMergedEpoch, persistWatchers = s.pausePersisterForMergerCatchUp(lastPersistedEpoch,
 			lastMergedEpoch, persistWatchers, po)

@@ -150,11 +152,25 @@ OUTER:
 					_ = ourSnapshot.DecRef()
 					break OUTER
 				}
+
+				// save this current snapshot's persistedCallbacks, to invoke during
+				// the retry attempt
+				unpersistedCallbacks = append(unpersistedCallbacks, ourPersistedCallbacks...)
+
 				s.fireAsyncError(fmt.Errorf("got err persisting snapshot: %v", err))
 				_ = ourSnapshot.DecRef()
 				atomic.AddUint64(&s.stats.TotPersistLoopErr, 1)
 				continue OUTER
 			}
+
+			if unpersistedCallbacks != nil {
+				// in the event of this being a retry attempt for persisting a snapshot
+				// that had earlier failed, prepend the persistedCallbacks associated
+				// with earlier segment(s) to the latest persistedCallbacks
+				ourPersistedCallbacks = append(unpersistedCallbacks, ourPersistedCallbacks...)
+				unpersistedCallbacks = nil
+			}
+
 			for i := range ourPersistedCallbacks {
 				ourPersistedCallbacks[i](err)
 			}
@@ -179,7 +195,6 @@ OUTER:
 			s.fireEvent(EventKindPersisterProgress, time.Since(startTime))

 			if changed {
-				s.removeOldData()
 				atomic.AddUint64(&s.stats.TotPersistLoopProgress, 1)
 				continue OUTER
 			}
@@ -230,20 +245,19 @@ func notifyMergeWatchers(lastPersistedEpoch uint64,
 	return watchersNext
 }

-func (s *Scorch) pausePersisterForMergerCatchUp(lastPersistedEpoch uint64, lastMergedEpoch uint64,
-	persistWatchers []*epochWatcher, po *persisterOptions) (uint64, []*epochWatcher) {
+func (s *Scorch) pausePersisterForMergerCatchUp(lastPersistedEpoch uint64,
+	lastMergedEpoch uint64, persistWatchers []*epochWatcher,
+	po *persisterOptions) (uint64, []*epochWatcher) {

-	// first, let the watchers proceed if they lag behind
+	// First, let the watchers proceed if they lag behind
 	persistWatchers = notifyMergeWatchers(lastPersistedEpoch, persistWatchers)

-	// check the merger lag by counting the segment files on disk,
+	// Check the merger lag by counting the segment files on disk,
+	numFilesOnDisk, _ := s.diskFileStats()
+
 	// On finding fewer files on disk, persister takes a short pause
 	// for sufficient in-memory segments to pile up for the next
 	// memory merge cum persist loop.
-	// On finding too many files on disk, persister pause until the merger
-	// catches up to reduce the segment file count under the threshold.
-	// But if there is memory pressure, then skip this sleep maneuvers.
-	numFilesOnDisk, _ := s.diskFileStats()
 	if numFilesOnDisk < uint64(po.PersisterNapUnderNumFiles) &&
 		po.PersisterNapTimeMSec > 0 && s.paused() == 0 {
 		select {
@@ -261,6 +275,17 @@ func (s *Scorch) pausePersisterForMergerCatchUp(lastPersistedEpoch uint64, lastM
 		return lastMergedEpoch, persistWatchers
 	}

+	// Finding too many files on disk could be due to two reasons.
+	// 1. Too many older snapshots awaiting the clean up.
+	// 2. The merger could be lagging behind on merging the disk files.
+	if numFilesOnDisk > uint64(po.PersisterNapUnderNumFiles) {
+		s.removeOldData()
+		numFilesOnDisk, _ = s.diskFileStats()
+	}
+
+	// Persister pause until the merger catches up to reduce the segment
+	// file count under the threshold.
+	// But if there is memory pressure, then skip this sleep maneuvers.
 OUTER:
 	for po.PersisterNapUnderNumFiles > 0 &&
 		numFilesOnDisk >= uint64(po.PersisterNapUnderNumFiles) &&
@@ -661,13 +686,13 @@ func (s *Scorch) LoadSnapshot(epoch uint64) (rv *IndexSnapshot, err error) {
 }

 func (s *Scorch) loadSnapshot(snapshot *bolt.Bucket) (*IndexSnapshot, error) {
+
 	rv := &IndexSnapshot{
 		parent:   s,
 		internal: make(map[string][]byte),
 		refs:     1,
 		creator:  "loadSnapshot",
 	}
-
 	var running uint64
 	c := snapshot.Cursor()
 	for k, _ := c.First(); k != nil; k, _ = c.Next() {
@@ -703,7 +728,6 @@ func (s *Scorch) loadSnapshot(snapshot *bolt.Bucket) (*IndexSnapshot, error) {
 			running += segmentSnapshot.segment.Count()
 		}
 	}
-
 	return rv, nil
 }

@@ -750,12 +774,11 @@ func (s *Scorch) removeOldData() {
 	if err != nil {
 		s.fireAsyncError(fmt.Errorf("got err removing old bolt snapshots: %v", err))
 	}
+	atomic.AddUint64(&s.stats.TotSnapshotsRemovedFromMetaStore, uint64(removed))

-	if removed > 0 {
-		err = s.removeOldZapFiles()
-		if err != nil {
-			s.fireAsyncError(fmt.Errorf("got err removing old zap files: %v", err))
-		}
+	err = s.removeOldZapFiles()
+	if err != nil {
+		s.fireAsyncError(fmt.Errorf("got err removing old zap files: %v", err))
 	}
 }

--- a/vendor/github.com/blevesearch/bleve/index/scorch/scorch.go
+++ b/vendor/github.com/blevesearch/bleve/index/scorch/scorch.go
@@ -41,12 +41,14 @@ const Version uint8 = 2
 var ErrClosed = fmt.Errorf("scorch closed")

 type Scorch struct {
+	nextSegmentID uint64
+	stats         Stats
+	iStats        internalStats
+
 	readOnly      bool
 	version       uint8
 	config        map[string]interface{}
 	analysisQueue *index.AnalysisQueue
-	stats         Stats
-	nextSegmentID uint64
 	path          string

 	unsafeBatch bool
@@ -73,8 +75,6 @@ type Scorch struct {
 	onEvent      func(event Event)
 	onAsyncError func(err error)

-	iStats internalStats
-
 	pauseLock sync.RWMutex

 	pauseCount uint64
@@ -312,7 +312,7 @@ func (s *Scorch) Batch(batch *index.Batch) (err error) {

 	// FIXME could sort ids list concurrent with analysis?

-	if len(batch.IndexOps) > 0 {
+	if numUpdates > 0 {
 		go func() {
 			for _, doc := range batch.IndexOps {
 				if doc != nil {
@@ -490,6 +490,9 @@ func (s *Scorch) StatsMap() map[string]interface{} {
 	m["CurOnDiskBytes"] = numBytesUsedDisk
 	m["CurOnDiskFiles"] = numFilesOnDisk

+	s.rootLock.RLock()
+	m["CurFilesIneligibleForRemoval"] = uint64(len(s.ineligibleForRemoval))
+	s.rootLock.RUnlock()
 	// TODO: consider one day removing these backwards compatible
 	// names for apps using the old names
 	m["updates"] = m["TotUpdates"]
--- a/vendor/github.com/blevesearch/bleve/index/scorch/segment/empty.go
+++ b/vendor/github.com/blevesearch/bleve/index/scorch/segment/empty.go
@@ -91,12 +91,20 @@ func (e *EmptyDictionary) OnlyIterator(onlyTerms [][]byte,
 	return &EmptyDictionaryIterator{}
 }

+func (e *EmptyDictionary) Contains(key []byte) (bool, error) {
+	return false, nil
+}
+
 type EmptyDictionaryIterator struct{}

 func (e *EmptyDictionaryIterator) Next() (*index.DictEntry, error) {
 	return nil, nil
 }

+func (e *EmptyDictionaryIterator) Contains(key []byte) (bool, error) {
+	return false, nil
+}
+
 func (e *EmptyPostingsIterator) Advance(uint64) (Posting, error) {
 	return nil, nil
 }
--- a/vendor/github.com/blevesearch/bleve/index/scorch/segment/int.go
+++ b/vendor/github.com/blevesearch/bleve/index/scorch/segment/int.go
@@ -19,7 +19,10 @@

 package segment

-import "fmt"
+import (
+	"errors"
+	"fmt"
+)

 const (
 	MaxVarintSize = 9
@@ -92,3 +95,82 @@ func DecodeUvarintAscending(b []byte) ([]byte, uint64, error) {
 	}
 	return b[length:], v, nil
 }
+
+// ------------------------------------------------------------
+
+type MemUvarintReader struct {
+	C int // index of next byte to read from S
+	S []byte
+}
+
+func NewMemUvarintReader(s []byte) *MemUvarintReader {
+	return &MemUvarintReader{S: s}
+}
+
+// Len returns the number of unread bytes.
+func (r *MemUvarintReader) Len() int {
+	n := len(r.S) - r.C
+	if n < 0 {
+		return 0
+	}
+	return n
+}
+
+var ErrMemUvarintReaderOverflow = errors.New("MemUvarintReader overflow")
+
+// ReadUvarint reads an encoded uint64.  The original code this was
+// based on is at encoding/binary/ReadUvarint().
+func (r *MemUvarintReader) ReadUvarint() (uint64, error) {
+	var x uint64
+	var s uint
+	var C = r.C
+	var S = r.S
+
+	for {
+		b := S[C]
+		C++
+
+		if b < 0x80 {
+			r.C = C
+
+			// why 63?  The original code had an 'i += 1' loop var and
+			// checked for i > 9 || i == 9 ...; but, we no longer
+			// check for the i var, but instead check here for s,
+			// which is incremented by 7.  So, 7*9 == 63.
+			//
+			// why the "extra" >= check?  The normal case is that s <
+			// 63, so we check this single >= guard first so that we
+			// hit the normal, nil-error return pathway sooner.
+			if s >= 63 && (s > 63 || s == 63 && b > 1) {
+				return 0, ErrMemUvarintReaderOverflow
+			}
+
+			return x | uint64(b)<<s, nil
+		}
+
+		x |= uint64(b&0x7f) << s
+		s += 7
+	}
+}
+
+// SkipUvarint skips ahead one encoded uint64.
+func (r *MemUvarintReader) SkipUvarint() {
+	for {
+		b := r.S[r.C]
+		r.C++
+
+		if b < 0x80 {
+			return
+		}
+	}
+}
+
+// SkipBytes skips a count number of bytes.
+func (r *MemUvarintReader) SkipBytes(count int) {
+	r.C = r.C + count
+}
+
+func (r *MemUvarintReader) Reset(s []byte) {
+	r.C = 0
+	r.S = s
+}
--- a/vendor/github.com/blevesearch/bleve/index/scorch/segment/regexp.go
+++ b/vendor/github.com/blevesearch/bleve/index/scorch/segment/regexp.go
@@ -55,7 +55,7 @@ func LiteralPrefix(s *syntax.Regexp) string {
 		s = s.Sub[0]
 	}

-	if s.Op == syntax.OpLiteral {
+	if s.Op == syntax.OpLiteral && (s.Flags&syntax.FoldCase == 0) {
 		return string(s.Rune)
 	}

--- a/vendor/github.com/blevesearch/bleve/index/scorch/segment/segment.go
+++ b/vendor/github.com/blevesearch/bleve/index/scorch/segment/segment.go
@@ -59,6 +59,8 @@ type TermDictionary interface {
 	AutomatonIterator(a vellum.Automaton,
 		startKeyInclusive, endKeyExclusive []byte) DictionaryIterator
 	OnlyIterator(onlyTerms [][]byte, includeCount bool) DictionaryIterator
+
+	Contains(key []byte) (bool, error)
 }

 type DictionaryIterator interface {
--- a/vendor/github.com/blevesearch/bleve/index/scorch/segment/zap/build.go
+++ b/vendor/github.com/blevesearch/bleve/index/scorch/segment/zap/build.go
@@ -16,6 +16,7 @@ package zap

 import (
 	"bufio"
+	"github.com/couchbase/vellum"
 	"math"
 	"os"
 )
@@ -137,6 +138,7 @@ func InitSegmentBase(mem []byte, memCRC uint32, chunkFactor uint32,
 		docValueOffset:    docValueOffset,
 		dictLocs:          dictLocs,
 		fieldDvReaders:    make(map[uint16]*docValueReader),
+		fieldFSTs:         make(map[uint16]*vellum.FST),
 	}
 	sb.updateSize()

--- a/vendor/github.com/blevesearch/bleve/index/scorch/segment/zap/dict.go
+++ b/vendor/github.com/blevesearch/bleve/index/scorch/segment/zap/dict.go
@@ -95,6 +95,10 @@ func (d *Dictionary) postingsListInit(rv *PostingsList, except *roaring.Bitmap)
 	return rv
 }

+func (d *Dictionary) Contains(key []byte) (bool, error) {
+	return d.fst.Contains(key)
+}
+
 // Iterator returns an iterator for this dictionary
 func (d *Dictionary) Iterator() segment.DictionaryIterator {
 	rv := &DictionaryIterator{
@@ -143,11 +147,14 @@ func (d *Dictionary) RangeIterator(start, end string) segment.DictionaryIterator
 	}

 	// need to increment the end position to be inclusive
-	endBytes := []byte(end)
-	if endBytes[len(endBytes)-1] < 0xff {
-		endBytes[len(endBytes)-1]++
-	} else {
-		endBytes = append(endBytes, 0xff)
+	var endBytes []byte
+	if len(end) > 0 {
+		endBytes = []byte(end)
+		if endBytes[len(endBytes)-1] < 0xff {
+			endBytes[len(endBytes)-1]++
+		} else {
+			endBytes = append(endBytes, 0xff)
+		}
 	}

 	if d.fst != nil {
--- a/vendor/github.com/blevesearch/bleve/index/scorch/segment/zap/docvalues.go
+++ b/vendor/github.com/blevesearch/bleve/index/scorch/segment/zap/docvalues.go
@@ -39,7 +39,7 @@ type docNumTermsVisitor func(docNum uint64, terms []byte) error

 type docVisitState struct {
 	dvrs    map[uint16]*docValueReader
-	segment *Segment
+	segment *SegmentBase
 }

 type docValueReader struct {
@@ -88,8 +88,8 @@ func (s *SegmentBase) loadFieldDocValueReader(field string,
 	fieldDvLocStart, fieldDvLocEnd uint64) (*docValueReader, error) {
 	// get the docValue offset for the given fields
 	if fieldDvLocStart == fieldNotUninverted {
-		return nil, fmt.Errorf("loadFieldDocValueReader: "+
-			"no docValues found for field: %s", field)
+		// no docValues found, nothing to do
+		return nil, nil
 	}

 	// read the number of chunks, and chunk offsets position
@@ -101,6 +101,8 @@ func (s *SegmentBase) loadFieldDocValueReader(field string,
 		chunkOffsetsLen := binary.BigEndian.Uint64(s.mem[fieldDvLocEnd-16 : fieldDvLocEnd-8])
 		// acquire position of chunk offsets
 		chunkOffsetsPosition = (fieldDvLocEnd - 16) - chunkOffsetsLen
+	} else {
+		return nil, fmt.Errorf("loadFieldDocValueReader: fieldDvLoc too small: %d-%d", fieldDvLocEnd, fieldDvLocStart)
 	}

 	fdvIter := &docValueReader{
@@ -250,7 +252,7 @@ func (di *docValueReader) getDocValueLocs(docNum uint64) (uint64, uint64) {

 // VisitDocumentFieldTerms is an implementation of the
 // DocumentFieldTermVisitable interface
-func (s *Segment) VisitDocumentFieldTerms(localDocNum uint64, fields []string,
+func (s *SegmentBase) VisitDocumentFieldTerms(localDocNum uint64, fields []string,
 	visitor index.DocumentFieldTermVisitor, dvsIn segment.DocVisitState) (
 	segment.DocVisitState, error) {
 	dvs, ok := dvsIn.(*docVisitState)
@@ -289,7 +291,7 @@ func (s *Segment) VisitDocumentFieldTerms(localDocNum uint64, fields []string,
 		if dvr, ok = dvs.dvrs[fieldID]; ok && dvr != nil {
 			// check if the chunk is already loaded
 			if docInChunk != dvr.curChunkNumber() {
-				err := dvr.loadDvChunk(docInChunk, &s.SegmentBase)
+				err := dvr.loadDvChunk(docInChunk, s)
 				if err != nil {
 					return dvs, err
 				}
@@ -304,6 +306,6 @@ func (s *Segment) VisitDocumentFieldTerms(localDocNum uint64, fields []string,
 // VisitableDocValueFields returns the list of fields with
 // persisted doc value terms ready to be visitable using the
 // VisitDocumentFieldTerms method.
-func (s *Segment) VisitableDocValueFields() ([]string, error) {
+func (s *SegmentBase) VisitableDocValueFields() ([]string, error) {
 	return s.fieldDvNames, nil
 }
--- a/vendor/github.com/blevesearch/bleve/index/scorch/segment/zap/merge.go
+++ b/vendor/github.com/blevesearch/bleve/index/scorch/segment/zap/merge.go
@@ -31,6 +31,14 @@ import (

 var DefaultFileMergerBufferSize = 1024 * 1024

+// ValidateMerge can be set by applications to perform additional checks
+// on a new segment produced by a merge, by default this does nothing.
+// Caller should provide EITHER segments or memSegments, but not both.
+// This API is experimental and may be removed at any time.
+var ValidateMerge = func(segments []*Segment, memSegments []*SegmentBase, drops []*roaring.Bitmap, newSegment *Segment) error {
+	return nil
+}
+
 const docDropped = math.MaxUint64 // sentinel docNum to represent a deleted doc

 // Merge takes a slice of zap segments and bit masks describing which
--- a/vendor/github.com/blevesearch/bleve/index/scorch/segment/zap/new.go
+++ b/vendor/github.com/blevesearch/bleve/index/scorch/segment/zap/new.go
@@ -33,6 +33,14 @@ var NewSegmentBufferNumResultsBump int = 100
 var NewSegmentBufferNumResultsFactor float64 = 1.0
 var NewSegmentBufferAvgBytesPerDocFactor float64 = 1.0

+// ValidateDocFields can be set by applications to perform additional checks
+// on fields in a document being added to a new segment, by default it does
+// nothing.
+// This API is experimental and may be removed at any time.
+var ValidateDocFields = func(field document.Field) error {
+	return nil
+}
+
 // AnalysisResultsToSegmentBase produces an in-memory zap-encoded
 // SegmentBase from analysis results
 func AnalysisResultsToSegmentBase(results []*index.AnalysisResult,
@@ -521,6 +529,11 @@ func (s *interim) writeStoredFields() (
 			if opts.IncludeDocValues() {
 				s.IncludeDocValues[fieldID] = true
 			}
+
+			err := ValidateDocFields(field)
+			if err != nil {
+				return 0, err
+			}
 		}

 		var curr int
--- a/vendor/github.com/blevesearch/bleve/index/scorch/segment/zap/posting.go
+++ b/vendor/github.com/blevesearch/bleve/index/scorch/segment/zap/posting.go
@@ -15,10 +15,8 @@
 package zap

 import (
-	"bytes"
 	"encoding/binary"
 	"fmt"
-	"io"
 	"math"
 	"reflect"

@@ -192,7 +190,7 @@ func (p *PostingsList) iterator(includeFreq, includeNorm, includeLocs bool,
 	}

 	rv.postings = p
-	rv.includeFreqNorm = includeFreq || includeNorm
+	rv.includeFreqNorm = includeFreq || includeNorm || includeLocs
 	rv.includeLocs = includeLocs

 	if p.normBits1Hit != 0 {
@@ -264,18 +262,17 @@ func (p *PostingsList) iterator(includeFreq, includeNorm, includeLocs bool,

 // Count returns the number of items on this postings list
 func (p *PostingsList) Count() uint64 {
-	var n uint64
+	var n, e uint64
 	if p.normBits1Hit != 0 {
 		n = 1
+		if p.except != nil && p.except.Contains(uint32(p.docNum1Hit)) {
+			e = 1
+		}
 	} else if p.postings != nil {
 		n = p.postings.GetCardinality()
-	}
-	var e uint64
-	if p.except != nil {
-		e = p.except.GetCardinality()
-	}
-	if n <= e {
-		return 0
+		if p.except != nil {
+			e = p.postings.AndCardinality(p.except)
+		}
 	}
 	return n - e
 }
@@ -327,16 +324,16 @@ func (rv *PostingsList) init1Hit(fstVal uint64) error {
 // PostingsIterator provides a way to iterate through the postings list
 type PostingsIterator struct {
 	postings *PostingsList
-	all      roaring.IntIterable
-	Actual   roaring.IntIterable
+	all      roaring.IntPeekable
+	Actual   roaring.IntPeekable
 	ActualBM *roaring.Bitmap

 	currChunk         uint32
 	currChunkFreqNorm []byte
 	currChunkLoc      []byte

-	freqNormReader *bytes.Reader
-	locReader      *bytes.Reader
+	freqNormReader *segment.MemUvarintReader
+	locReader      *segment.MemUvarintReader

 	freqChunkOffsets []uint64
 	freqChunkStart   uint64
@@ -387,7 +384,7 @@ func (i *PostingsIterator) loadChunk(chunk int) error {
 		end += e
 		i.currChunkFreqNorm = i.postings.sb.mem[start:end]
 		if i.freqNormReader == nil {
-			i.freqNormReader = bytes.NewReader(i.currChunkFreqNorm)
+			i.freqNormReader = segment.NewMemUvarintReader(i.currChunkFreqNorm)
 		} else {
 			i.freqNormReader.Reset(i.currChunkFreqNorm)
 		}
@@ -405,7 +402,7 @@ func (i *PostingsIterator) loadChunk(chunk int) error {
 		end += e
 		i.currChunkLoc = i.postings.sb.mem[start:end]
 		if i.locReader == nil {
-			i.locReader = bytes.NewReader(i.currChunkLoc)
+			i.locReader = segment.NewMemUvarintReader(i.currChunkLoc)
 		} else {
 			i.locReader.Reset(i.currChunkLoc)
 		}
@@ -420,18 +417,34 @@ func (i *PostingsIterator) readFreqNormHasLocs() (uint64, uint64, bool, error) {
 		return 1, i.normBits1Hit, false, nil
 	}

-	freqHasLocs, err := binary.ReadUvarint(i.freqNormReader)
+	freqHasLocs, err := i.freqNormReader.ReadUvarint()
 	if err != nil {
 		return 0, 0, false, fmt.Errorf("error reading frequency: %v", err)
 	}
+
 	freq, hasLocs := decodeFreqHasLocs(freqHasLocs)

-	normBits, err := binary.ReadUvarint(i.freqNormReader)
+	normBits, err := i.freqNormReader.ReadUvarint()
 	if err != nil {
 		return 0, 0, false, fmt.Errorf("error reading norm: %v", err)
 	}

-	return freq, normBits, hasLocs, err
+	return freq, normBits, hasLocs, nil
+}
+
+func (i *PostingsIterator) skipFreqNormReadHasLocs() (bool, error) {
+	if i.normBits1Hit != 0 {
+		return false, nil
+	}
+
+	freqHasLocs, err := i.freqNormReader.ReadUvarint()
+	if err != nil {
+		return false, fmt.Errorf("error reading freqHasLocs: %v", err)
+	}
+
+	i.freqNormReader.SkipUvarint() // Skip normBits.
+
+	return freqHasLocs&0x01 != 0, nil // See decodeFreqHasLocs() / hasLocs.
 }

 func encodeFreqHasLocs(freq uint64, hasLocs bool) uint64 {
@@ -449,58 +462,53 @@ func decodeFreqHasLocs(freqHasLocs uint64) (uint64, bool) {
 }

 // readLocation processes all the integers on the stream representing a single
-// location.  if you care about it, pass in a non-nil location struct, and we
-// will fill it.  if you don't care about it, pass in nil and we safely consume
-// the contents.
+// location.
 func (i *PostingsIterator) readLocation(l *Location) error {
 	// read off field
-	fieldID, err := binary.ReadUvarint(i.locReader)
+	fieldID, err := i.locReader.ReadUvarint()
 	if err != nil {
 		return fmt.Errorf("error reading location field: %v", err)
 	}
 	// read off pos
-	pos, err := binary.ReadUvarint(i.locReader)
+	pos, err := i.locReader.ReadUvarint()
 	if err != nil {
 		return fmt.Errorf("error reading location pos: %v", err)
 	}
 	// read off start
-	start, err := binary.ReadUvarint(i.locReader)
+	start, err := i.locReader.ReadUvarint()
 	if err != nil {
 		return fmt.Errorf("error reading location start: %v", err)
 	}
 	// read off end
-	end, err := binary.ReadUvarint(i.locReader)
+	end, err := i.locReader.ReadUvarint()
 	if err != nil {
 		return fmt.Errorf("error reading location end: %v", err)
 	}
 	// read off num array pos
-	numArrayPos, err := binary.ReadUvarint(i.locReader)
+	numArrayPos, err := i.locReader.ReadUvarint()
 	if err != nil {
 		return fmt.Errorf("error reading location num array pos: %v", err)
 	}

-	// group these together for less branching
-	if l != nil {
-		l.field = i.postings.sb.fieldsInv[fieldID]
-		l.pos = pos
-		l.start = start
-		l.end = end
-		if cap(l.ap) < int(numArrayPos) {
-			l.ap = make([]uint64, int(numArrayPos))
-		} else {
-			l.ap = l.ap[:int(numArrayPos)]
-		}
+	l.field = i.postings.sb.fieldsInv[fieldID]
+	l.pos = pos
+	l.start = start
+	l.end = end
+
+	if cap(l.ap) < int(numArrayPos) {
+		l.ap = make([]uint64, int(numArrayPos))
+	} else {
+		l.ap = l.ap[:int(numArrayPos)]
 	}

 	// read off array positions
 	for k := 0; k < int(numArrayPos); k++ {
-		ap, err := binary.ReadUvarint(i.locReader)
+		ap, err := i.locReader.ReadUvarint()
 		if err != nil {
 			return fmt.Errorf("error reading array position: %v", err)
 		}
-		if l != nil {
-			l.ap[k] = ap
-		}
+
+		l.ap[k] = ap
 	}

 	return nil
@@ -557,7 +565,7 @@ func (i *PostingsIterator) nextAtOrAfter(atOrAfter uint64) (segment.Posting, err
 		}
 		rv.locs = i.nextSegmentLocs[:0]

-		numLocsBytes, err := binary.ReadUvarint(i.locReader)
+		numLocsBytes, err := i.locReader.ReadUvarint()
 		if err != nil {
 			return nil, fmt.Errorf("error reading location numLocsBytes: %v", err)
 		}
@@ -613,17 +621,14 @@ func (i *PostingsIterator) nextBytes() (
 	if hasLocs {
 		startLoc := len(i.currChunkLoc) - i.locReader.Len()

-		numLocsBytes, err := binary.ReadUvarint(i.locReader)
+		numLocsBytes, err := i.locReader.ReadUvarint()
 		if err != nil {
 			return 0, 0, 0, nil, nil,
 				fmt.Errorf("error reading location nextBytes numLocs: %v", err)
 		}

 		// skip over all the location bytes
-		_, err = i.locReader.Seek(int64(numLocsBytes), io.SeekCurrent)
-		if err != nil {
-			return 0, 0, 0, nil, nil, err
-		}
+		i.locReader.SkipBytes(int(numLocsBytes))

 		endLoc := len(i.currChunkLoc) - i.locReader.Len()
 		bytesLoc = i.currChunkLoc[startLoc:endLoc]
@@ -657,14 +662,14 @@ func (i *PostingsIterator) nextDocNumAtOrAfter(atOrAfter uint64) (uint64, bool,
 		return i.nextDocNumAtOrAfterClean(atOrAfter)
 	}

-	n := i.Actual.Next()
-	for uint64(n) < atOrAfter && i.Actual.HasNext() {
-		n = i.Actual.Next()
-	}
-	if uint64(n) < atOrAfter {
+	i.Actual.AdvanceIfNeeded(uint32(atOrAfter))
+
+	if !i.Actual.HasNext() {
 		// couldn't find anything
 		return 0, false, nil
 	}
+
+	n := i.Actual.Next()
 	allN := i.all.Next()

 	nChunk := n / i.postings.sb.chunkFactor
@@ -701,23 +706,20 @@ func (i *PostingsIterator) nextDocNumAtOrAfter(atOrAfter uint64) (uint64, bool,
 // no deletions) where the all bitmap is the same as the actual bitmap
 func (i *PostingsIterator) nextDocNumAtOrAfterClean(
 	atOrAfter uint64) (uint64, bool, error) {
-	n := i.Actual.Next()

 	if !i.includeFreqNorm {
-		for uint64(n) < atOrAfter && i.Actual.HasNext() {
-			n = i.Actual.Next()
-		}
+		i.Actual.AdvanceIfNeeded(uint32(atOrAfter))

-		if uint64(n) < atOrAfter {
+		if !i.Actual.HasNext() {
 			return 0, false, nil // couldn't find anything
 		}

-		return uint64(n), true, nil
+		return uint64(i.Actual.Next()), true, nil
 	}

 	// freq-norm's needed, so maintain freq-norm chunk reader
 	sameChunkNexts := 0 // # of times we called Next() in the same chunk
-
+	n := i.Actual.Next()
 	nChunk := n / i.postings.sb.chunkFactor

 	for uint64(n) < atOrAfter && i.Actual.HasNext() {
@@ -764,22 +766,19 @@ func (i *PostingsIterator) currChunkNext(nChunk uint32) error {
 	}

 	// read off freq/offsets even though we don't care about them
-	_, _, hasLocs, err := i.readFreqNormHasLocs()
+	hasLocs, err := i.skipFreqNormReadHasLocs()
 	if err != nil {
 		return err
 	}

 	if i.includeLocs && hasLocs {
-		numLocsBytes, err := binary.ReadUvarint(i.locReader)
+		numLocsBytes, err := i.locReader.ReadUvarint()
 		if err != nil {
 			return fmt.Errorf("error reading location numLocsBytes: %v", err)
 		}

 		// skip over all the location bytes
-		_, err = i.locReader.Seek(int64(numLocsBytes), io.SeekCurrent)
-		if err != nil {
-			return err
-		}
+		i.locReader.SkipBytes(int(numLocsBytes))
 	}

 	return nil
--- a/vendor/github.com/blevesearch/bleve/index/scorch/segment/zap/segment.go
+++ b/vendor/github.com/blevesearch/bleve/index/scorch/segment/zap/segment.go
@@ -20,8 +20,8 @@ import (
 	"fmt"
 	"io"
 	"os"
-	"reflect"
 	"sync"
+	"unsafe"

 	"github.com/RoaringBitmap/roaring"
 	"github.com/blevesearch/bleve/index/scorch/segment"
@@ -35,7 +35,7 @@ var reflectStaticSizeSegmentBase int

 func init() {
 	var sb SegmentBase
-	reflectStaticSizeSegmentBase = int(reflect.TypeOf(sb).Size())
+	reflectStaticSizeSegmentBase = int(unsafe.Sizeof(sb))
 }

 // Open returns a zap impl of a segment
@@ -56,6 +56,7 @@ func Open(path string) (segment.Segment, error) {
 			mem:            mm[0 : len(mm)-FooterSize],
 			fieldsMap:      make(map[string]uint16),
 			fieldDvReaders: make(map[uint16]*docValueReader),
+			fieldFSTs:      make(map[uint16]*vellum.FST),
 		},
 		f:    f,
 		mm:   mm,
@@ -101,6 +102,9 @@ type SegmentBase struct {
 	fieldDvReaders    map[uint16]*docValueReader // naive chunk cache per field
 	fieldDvNames      []string                   // field names cached in fieldDvReaders
 	size              uint64
+
+	m         sync.Mutex
+	fieldFSTs map[uint16]*vellum.FST
 }

 func (sb *SegmentBase) Size() int {
@@ -258,19 +262,27 @@ func (sb *SegmentBase) dictionary(field string) (rv *Dictionary, err error) {

 		dictStart := sb.dictLocs[rv.fieldID]
 		if dictStart > 0 {
-			// read the length of the vellum data
-			vellumLen, read := binary.Uvarint(sb.mem[dictStart : dictStart+binary.MaxVarintLen64])
-			fstBytes := sb.mem[dictStart+uint64(read) : dictStart+uint64(read)+vellumLen]
-			if fstBytes != nil {
+			var ok bool
+			sb.m.Lock()
+			if rv.fst, ok = sb.fieldFSTs[rv.fieldID]; !ok {
+				// read the length of the vellum data
+				vellumLen, read := binary.Uvarint(sb.mem[dictStart : dictStart+binary.MaxVarintLen64])
+				fstBytes := sb.mem[dictStart+uint64(read) : dictStart+uint64(read)+vellumLen]
 				rv.fst, err = vellum.Load(fstBytes)
 				if err != nil {
+					sb.m.Unlock()
 					return nil, fmt.Errorf("dictionary field %s vellum err: %v", field, err)
 				}
-				rv.fstReader, err = rv.fst.Reader()
-				if err != nil {
-					return nil, fmt.Errorf("dictionary field %s vellum reader err: %v", field, err)
-				}
+
+				sb.fieldFSTs[rv.fieldID] = rv.fst
 			}
+
+			sb.m.Unlock()
+			rv.fstReader, err = rv.fst.Reader()
+			if err != nil {
+				return nil, fmt.Errorf("dictionary field %s vellum reader err: %v", field, err)
+			}
+
 		}
 	}

@@ -527,7 +539,7 @@ func (s *Segment) DictAddr(field string) (uint64, error) {
 }

 func (s *SegmentBase) loadDvReaders() error {
-	if s.docValueOffset == fieldNotUninverted {
+	if s.docValueOffset == fieldNotUninverted || s.numDocs == 0 {
 		return nil
 	}

@@ -546,7 +558,10 @@ func (s *SegmentBase) loadDvReaders() error {
 		}
 		read += uint64(n)

-		fieldDvReader, _ := s.loadFieldDocValueReader(field, fieldLocStart, fieldLocEnd)
+		fieldDvReader, err := s.loadFieldDocValueReader(field, fieldLocStart, fieldLocEnd)
+		if err != nil {
+			return err
+		}
 		if fieldDvReader != nil {
 			s.fieldDvReaders[uint16(fieldID)] = fieldDvReader
 			s.fieldDvNames = append(s.fieldDvNames, field)
--- a/vendor/github.com/blevesearch/bleve/index/scorch/snapshot_index.go
+++ b/vendor/github.com/blevesearch/bleve/index/scorch/snapshot_index.go
@@ -28,13 +28,14 @@ import (
 	"github.com/blevesearch/bleve/index"
 	"github.com/blevesearch/bleve/index/scorch/segment"
 	"github.com/couchbase/vellum"
-	lev2 "github.com/couchbase/vellum/levenshtein2"
+	lev "github.com/couchbase/vellum/levenshtein"
 )

 // re usable, threadsafe levenshtein builders
-var lb1, lb2 *lev2.LevenshteinAutomatonBuilder
+var lb1, lb2 *lev.LevenshteinAutomatonBuilder

 type asynchSegmentResult struct {
+	dict    segment.TermDictionary
 	dictItr segment.DictionaryIterator

 	index int
@@ -51,11 +52,11 @@ func init() {
 	var is interface{} = IndexSnapshot{}
 	reflectStaticSizeIndexSnapshot = int(reflect.TypeOf(is).Size())
 	var err error
-	lb1, err = lev2.NewLevenshteinAutomatonBuilder(1, true)
+	lb1, err = lev.NewLevenshteinAutomatonBuilder(1, true)
 	if err != nil {
 		panic(fmt.Errorf("Levenshtein automaton ed1 builder err: %v", err))
 	}
-	lb2, err = lev2.NewLevenshteinAutomatonBuilder(2, true)
+	lb2, err = lev.NewLevenshteinAutomatonBuilder(2, true)
 	if err != nil {
 		panic(fmt.Errorf("Levenshtein automaton ed2 builder err: %v", err))
 	}
@@ -126,7 +127,9 @@ func (i *IndexSnapshot) updateSize() {
 	}
 }

-func (i *IndexSnapshot) newIndexSnapshotFieldDict(field string, makeItr func(i segment.TermDictionary) segment.DictionaryIterator) (*IndexSnapshotFieldDict, error) {
+func (i *IndexSnapshot) newIndexSnapshotFieldDict(field string,
+	makeItr func(i segment.TermDictionary) segment.DictionaryIterator,
+	randomLookup bool) (*IndexSnapshotFieldDict, error) {

 	results := make(chan *asynchSegmentResult)
 	for index, segment := range i.segment {
@@ -135,7 +138,11 @@ func (i *IndexSnapshot) newIndexSnapshotFieldDict(field string, makeItr func(i s
 			if err != nil {
 				results <- &asynchSegmentResult{err: err}
 			} else {
-				results <- &asynchSegmentResult{dictItr: makeItr(dict)}
+				if randomLookup {
+					results <- &asynchSegmentResult{dict: dict}
+				} else {
+					results <- &asynchSegmentResult{dictItr: makeItr(dict)}
+				}
 			}
 		}(index, segment)
 	}
@@ -150,14 +157,20 @@ func (i *IndexSnapshot) newIndexSnapshotFieldDict(field string, makeItr func(i s
 		if asr.err != nil && err == nil {
 			err = asr.err
 		} else {
-			next, err2 := asr.dictItr.Next()
-			if err2 != nil && err == nil {
-				err = err2
-			}
-			if next != nil {
+			if !randomLookup {
+				next, err2 := asr.dictItr.Next()
+				if err2 != nil && err == nil {
+					err = err2
+				}
+				if next != nil {
+					rv.cursors = append(rv.cursors, &segmentDictCursor{
+						itr:  asr.dictItr,
+						curr: *next,
+					})
+				}
+			} else {
 				rv.cursors = append(rv.cursors, &segmentDictCursor{
-					itr:  asr.dictItr,
-					curr: *next,
+					dict: asr.dict,
 				})
 			}
 		}
@@ -166,8 +179,11 @@ func (i *IndexSnapshot) newIndexSnapshotFieldDict(field string, makeItr func(i s
 	if err != nil {
 		return nil, err
 	}
-	// prepare heap
-	heap.Init(rv)
+
+	if !randomLookup {
+		// prepare heap
+		heap.Init(rv)
+	}

 	return rv, nil
 }
@@ -175,21 +191,21 @@ func (i *IndexSnapshot) newIndexSnapshotFieldDict(field string, makeItr func(i s
 func (i *IndexSnapshot) FieldDict(field string) (index.FieldDict, error) {
 	return i.newIndexSnapshotFieldDict(field, func(i segment.TermDictionary) segment.DictionaryIterator {
 		return i.Iterator()
-	})
+	}, false)
 }

 func (i *IndexSnapshot) FieldDictRange(field string, startTerm []byte,
 	endTerm []byte) (index.FieldDict, error) {
 	return i.newIndexSnapshotFieldDict(field, func(i segment.TermDictionary) segment.DictionaryIterator {
 		return i.RangeIterator(string(startTerm), string(endTerm))
-	})
+	}, false)
 }

 func (i *IndexSnapshot) FieldDictPrefix(field string,
 	termPrefix []byte) (index.FieldDict, error) {
 	return i.newIndexSnapshotFieldDict(field, func(i segment.TermDictionary) segment.DictionaryIterator {
 		return i.PrefixIterator(string(termPrefix))
-	})
+	}, false)
 }

 func (i *IndexSnapshot) FieldDictRegexp(field string,
@@ -204,7 +220,7 @@ func (i *IndexSnapshot) FieldDictRegexp(field string,

 	return i.newIndexSnapshotFieldDict(field, func(i segment.TermDictionary) segment.DictionaryIterator {
 		return i.AutomatonIterator(a, prefixBeg, prefixEnd)
-	})
+	}, false)
 }

 func (i *IndexSnapshot) getLevAutomaton(term string,
@@ -232,14 +248,18 @@ func (i *IndexSnapshot) FieldDictFuzzy(field string,

 	return i.newIndexSnapshotFieldDict(field, func(i segment.TermDictionary) segment.DictionaryIterator {
 		return i.AutomatonIterator(a, prefixBeg, prefixEnd)
-	})
+	}, false)
 }

 func (i *IndexSnapshot) FieldDictOnly(field string,
 	onlyTerms [][]byte, includeCount bool) (index.FieldDict, error) {
 	return i.newIndexSnapshotFieldDict(field, func(i segment.TermDictionary) segment.DictionaryIterator {
 		return i.OnlyIterator(onlyTerms, includeCount)
-	})
+	}, false)
+}
+
+func (i *IndexSnapshot) FieldDictContains(field string) (index.FieldDictContains, error) {
+	return i.newIndexSnapshotFieldDict(field, nil, true)
 }

 func (i *IndexSnapshot) DocIDReaderAll() (index.DocIDReader, error) {
--- a/vendor/github.com/blevesearch/bleve/index/scorch/snapshot_index_dict.go
+++ b/vendor/github.com/blevesearch/bleve/index/scorch/snapshot_index_dict.go
@@ -22,6 +22,7 @@ import (
 )

 type segmentDictCursor struct {
+	dict segment.TermDictionary
 	itr  segment.DictionaryIterator
 	curr index.DictEntry
 }
@@ -91,3 +92,17 @@ func (i *IndexSnapshotFieldDict) Next() (*index.DictEntry, error) {
 func (i *IndexSnapshotFieldDict) Close() error {
 	return nil
 }
+
+func (i *IndexSnapshotFieldDict) Contains(key []byte) (bool, error) {
+	if len(i.cursors) == 0 {
+		return false, nil
+	}
+
+	for _, cursor := range i.cursors {
+		if found, _ := cursor.dict.Contains(key); found {
+			return true, nil
+		}
+	}
+
+	return false, nil
+}
--- a/vendor/github.com/blevesearch/bleve/index/scorch/snapshot_segment.go
+++ b/vendor/github.com/blevesearch/bleve/index/scorch/snapshot_segment.go
@@ -183,9 +183,9 @@ func (cfd *cachedFieldDocs) prepareField(field string, ss *SegmentSnapshot) {
 }

 type cachedDocs struct {
+	size  uint64
 	m     sync.Mutex                  // As the cache is asynchronously prepared, need a lock
 	cache map[string]*cachedFieldDocs // Keyed by field
-	size  uint64
 }

 func (c *cachedDocs) prepareFields(wantedFields []string, ss *SegmentSnapshot) error {
--- a/vendor/github.com/blevesearch/bleve/index/scorch/stats.go
+++ b/vendor/github.com/blevesearch/bleve/index/scorch/stats.go
@@ -107,6 +107,9 @@ type Stats struct {
 	TotFileMergeIntroductionsDone    uint64
 	TotFileMergeIntroductionsSkipped uint64

+	CurFilesIneligibleForRemoval     uint64
+	TotSnapshotsRemovedFromMetaStore uint64
+
 	TotMemMergeBeg          uint64
 	TotMemMergeErr          uint64
 	TotMemMergeDone         uint64
--- a/vendor/github.com/blevesearch/bleve/index/upsidedown/upsidedown.go
+++ b/vendor/github.com/blevesearch/bleve/index/upsidedown/upsidedown.go
@@ -415,7 +415,6 @@ func (udc *UpsideDownCouch) Close() error {
 func (udc *UpsideDownCouch) Update(doc *document.Document) (err error) {
 	// do analysis before acquiring write lock
 	analysisStart := time.Now()
-	numPlainTextBytes := doc.NumPlainTextBytes()
 	resultChan := make(chan *index.AnalysisResult)
 	aw := index.NewAnalysisWork(udc, doc, resultChan)

@@ -452,6 +451,11 @@ func (udc *UpsideDownCouch) Update(doc *document.Document) (err error) {
 		return
 	}

+	return udc.UpdateWithAnalysis(doc, result, backIndexRow)
+}
+
+func (udc *UpsideDownCouch) UpdateWithAnalysis(doc *document.Document,
+	result *index.AnalysisResult, backIndexRow *BackIndexRow) (err error) {
 	// start a writer for this update
 	indexStart := time.Now()
 	var kvwriter store.KVWriter
@@ -490,7 +494,7 @@ func (udc *UpsideDownCouch) Update(doc *document.Document) (err error) {
 	atomic.AddUint64(&udc.stats.indexTime, uint64(time.Since(indexStart)))
 	if err == nil {
 		atomic.AddUint64(&udc.stats.updates, 1)
-		atomic.AddUint64(&udc.stats.numPlainTextBytesIndexed, numPlainTextBytes)
+		atomic.AddUint64(&udc.stats.numPlainTextBytesIndexed, doc.NumPlainTextBytes())
 	} else {
 		atomic.AddUint64(&udc.stats.errors, 1)
 	}
@@ -797,6 +801,10 @@ func (udc *UpsideDownCouch) termFieldVectorsFromTermVectors(in []*TermVector) []
 }

 func (udc *UpsideDownCouch) Batch(batch *index.Batch) (err error) {
+	persistedCallback := batch.PersistedCallback()
+	if persistedCallback != nil {
+		defer persistedCallback(err)
+	}
 	analysisStart := time.Now()

 	resultChan := make(chan *index.AnalysisResult, len(batch.IndexOps))
@@ -810,7 +818,7 @@ func (udc *UpsideDownCouch) Batch(batch *index.Batch) (err error) {
 		}
 	}

-	if len(batch.IndexOps) > 0 {
+	if numUpdates > 0 {
 		go func() {
 			for _, doc := range batch.IndexOps {
 				if doc != nil {
@@ -961,10 +969,6 @@ func (udc *UpsideDownCouch) Batch(batch *index.Batch) (err error) {
 		atomic.AddUint64(&udc.stats.errors, 1)
 	}

-	persistedCallback := batch.PersistedCallback()
-	if persistedCallback != nil {
-		persistedCallback(err)
-	}
 	return
 }

--- a/vendor/github.com/blevesearch/bleve/index_alias_impl.go
+++ b/vendor/github.com/blevesearch/bleve/index_alias_impl.go
@@ -434,6 +434,8 @@ func createChildSearchRequest(req *SearchRequest) *SearchRequest {
 		Sort:             req.Sort.Copy(),
 		IncludeLocations: req.IncludeLocations,
 		Score:            req.Score,
+		SearchAfter:      req.SearchAfter,
+		SearchBefore:     req.SearchBefore,
 	}
 	return &rv
 }
@@ -451,6 +453,14 @@ func MultiSearch(ctx context.Context, req *SearchRequest, indexes ...Index) (*Se
 	searchStart := time.Now()
 	asyncResults := make(chan *asyncSearchResult, len(indexes))

+	var reverseQueryExecution bool
+	if req.SearchBefore != nil {
+		reverseQueryExecution = true
+		req.Sort.Reverse()
+		req.SearchAfter = req.SearchBefore
+		req.SearchBefore = nil
+	}
+
 	// run search on each index in separate go routine
 	var waitGroup sync.WaitGroup

@@ -503,7 +513,7 @@ func MultiSearch(ctx context.Context, req *SearchRequest, indexes ...Index) (*Se

 	// sort all hits with the requested order
 	if len(req.Sort) > 0 {
-		sorter := newMultiSearchHitSorter(req.Sort, sr.Hits)
+		sorter := newSearchHitSorter(req.Sort, sr.Hits)
 		sort.Sort(sorter)
 	}

@@ -524,6 +534,17 @@ func MultiSearch(ctx context.Context, req *SearchRequest, indexes ...Index) (*Se
 		sr.Facets.Fixup(name, fr.Size)
 	}

+	if reverseQueryExecution {
+		// reverse the sort back to the original
+		req.Sort.Reverse()
+		// resort using the original order
+		mhs := newSearchHitSorter(req.Sort, sr.Hits)
+		sort.Sort(mhs)
+		// reset request
+		req.SearchBefore = req.SearchAfter
+		req.SearchAfter = nil
+	}
+
 	// fix up original request
 	sr.Request = req
 	searchDuration := time.Since(searchStart)
@@ -581,26 +602,3 @@ func (f *indexAliasImplFieldDict) Close() error {
 	defer f.index.mutex.RUnlock()
 	return f.fieldDict.Close()
 }
-
-type multiSearchHitSorter struct {
-	hits          search.DocumentMatchCollection
-	sort          search.SortOrder
-	cachedScoring []bool
-	cachedDesc    []bool
-}
-
-func newMultiSearchHitSorter(sort search.SortOrder, hits search.DocumentMatchCollection) *multiSearchHitSorter {
-	return &multiSearchHitSorter{
-		sort:          sort,
-		hits:          hits,
-		cachedScoring: sort.CacheIsScore(),
-		cachedDesc:    sort.CacheDescending(),
-	}
-}
-
-func (m *multiSearchHitSorter) Len() int      { return len(m.hits) }
-func (m *multiSearchHitSorter) Swap(i, j int) { m.hits[i], m.hits[j] = m.hits[j], m.hits[i] }
-func (m *multiSearchHitSorter) Less(i, j int) bool {
-	c := m.sort.Compare(m.cachedScoring, m.cachedDesc, m.hits[i], m.hits[j])
-	return c < 0
-}
--- a/vendor/github.com/blevesearch/bleve/index_impl.go
+++ b/vendor/github.com/blevesearch/bleve/index_impl.go
@@ -19,6 +19,7 @@ import (
 	"encoding/json"
 	"fmt"
 	"os"
+	"sort"
 	"sync"
 	"sync/atomic"
 	"time"
@@ -442,7 +443,20 @@ func (i *indexImpl) SearchInContext(ctx context.Context, req *SearchRequest) (sr
 		return nil, ErrorIndexClosed
 	}

-	collector := collector.NewTopNCollector(req.Size, req.From, req.Sort)
+	var reverseQueryExecution bool
+	if req.SearchBefore != nil {
+		reverseQueryExecution = true
+		req.Sort.Reverse()
+		req.SearchAfter = req.SearchBefore
+		req.SearchBefore = nil
+	}
+
+	var coll *collector.TopNCollector
+	if req.SearchAfter != nil {
+		coll = collector.NewTopNCollectorAfter(req.Size, req.Sort, req.SearchAfter)
+	} else {
+		coll = collector.NewTopNCollector(req.Size, req.From, req.Sort)
+	}

 	// open a reader for this search
 	indexReader, err := i.i.Reader()
@@ -494,10 +508,10 @@ func (i *indexImpl) SearchInContext(ctx context.Context, req *SearchRequest) (sr
 				facetsBuilder.Add(facetName, facetBuilder)
 			}
 		}
-		collector.SetFacetsBuilder(facetsBuilder)
+		coll.SetFacetsBuilder(facetsBuilder)
 	}

-	memNeeded := memNeededForSearch(req, searcher, collector)
+	memNeeded := memNeededForSearch(req, searcher, coll)
 	if cb := ctx.Value(SearchQueryStartCallbackKey); cb != nil {
 		if cbF, ok := cb.(SearchQueryStartCallbackFn); ok {
 			err = cbF(memNeeded)
@@ -515,12 +529,12 @@ func (i *indexImpl) SearchInContext(ctx context.Context, req *SearchRequest) (sr
 		}
 	}

-	err = collector.Collect(ctx, searcher, indexReader)
+	err = coll.Collect(ctx, searcher, indexReader)
 	if err != nil {
 		return nil, err
 	}

-	hits := collector.Results()
+	hits := coll.Results()

 	var highlighter highlight.Highlighter

@@ -542,71 +556,13 @@ func (i *indexImpl) SearchInContext(ctx context.Context, req *SearchRequest) (sr
 	}

 	for _, hit := range hits {
-		if len(req.Fields) > 0 || highlighter != nil {
-			doc, err := indexReader.Document(hit.ID)
-			if err == nil && doc != nil {
-				if len(req.Fields) > 0 {
-					fieldsToLoad := deDuplicate(req.Fields)
-					for _, f := range fieldsToLoad {
-						for _, docF := range doc.Fields {
-							if f == "*" || docF.Name() == f {
-								var value interface{}
-								switch docF := docF.(type) {
-								case *document.TextField:
-									value = string(docF.Value())
-								case *document.NumericField:
-									num, err := docF.Number()
-									if err == nil {
-										value = num
-									}
-								case *document.DateTimeField:
-									datetime, err := docF.DateTime()
-									if err == nil {
-										value = datetime.Format(time.RFC3339)
-									}
-								case *document.BooleanField:
-									boolean, err := docF.Boolean()
-									if err == nil {
-										value = boolean
-									}
-								case *document.GeoPointField:
-									lon, err := docF.Lon()
-									if err == nil {
-										lat, err := docF.Lat()
-										if err == nil {
-											value = []float64{lon, lat}
-										}
-									}
-								}
-								if value != nil {
-									hit.AddFieldValue(docF.Name(), value)
-								}
-							}
-						}
-					}
-				}
-				if highlighter != nil {
-					highlightFields := req.Highlight.Fields
-					if highlightFields == nil {
-						// add all fields with matches
-						highlightFields = make([]string, 0, len(hit.Locations))
-						for k := range hit.Locations {
-							highlightFields = append(highlightFields, k)
-						}
-					}
-					for _, hf := range highlightFields {
-						highlighter.BestFragmentsInField(hit, doc, hf, 1)
-					}
-				}
-			} else if doc == nil {
-				// unexpected case, a doc ID that was found as a search hit
-				// was unable to be found during document lookup
-				return nil, ErrorIndexReadInconsistency
-			}
-		}
 		if i.name != "" {
 			hit.Index = i.name
 		}
+		err = LoadAndHighlightFields(hit, req, i.name, indexReader, highlighter)
+		if err != nil {
+			return nil, err
+		}
 	}

 	atomic.AddUint64(&i.stats.searches, 1)
@@ -618,6 +574,17 @@ func (i *indexImpl) SearchInContext(ctx context.Context, req *SearchRequest) (sr
 		logger.Printf("slow search took %s - %v", searchDuration, req)
 	}

+	if reverseQueryExecution {
+		// reverse the sort back to the original
+		req.Sort.Reverse()
+		// resort using the original order
+		mhs := newSearchHitSorter(req.Sort, hits)
+		sort.Sort(mhs)
+		// reset request
+		req.SearchBefore = req.SearchAfter
+		req.SearchAfter = nil
+	}
+
 	return &SearchResult{
 		Status: &SearchStatus{
 			Total:      1,
@@ -625,13 +592,82 @@ func (i *indexImpl) SearchInContext(ctx context.Context, req *SearchRequest) (sr
 		},
 		Request:  req,
 		Hits:     hits,
-		Total:    collector.Total(),
-		MaxScore: collector.MaxScore(),
+		Total:    coll.Total(),
+		MaxScore: coll.MaxScore(),
 		Took:     searchDuration,
-		Facets:   collector.FacetResults(),
+		Facets:   coll.FacetResults(),
 	}, nil
 }

+func LoadAndHighlightFields(hit *search.DocumentMatch, req *SearchRequest,
+	indexName string, r index.IndexReader,
+	highlighter highlight.Highlighter) error {
+	if len(req.Fields) > 0 || highlighter != nil {
+		doc, err := r.Document(hit.ID)
+		if err == nil && doc != nil {
+			if len(req.Fields) > 0 {
+				fieldsToLoad := deDuplicate(req.Fields)
+				for _, f := range fieldsToLoad {
+					for _, docF := range doc.Fields {
+						if f == "*" || docF.Name() == f {
+							var value interface{}
+							switch docF := docF.(type) {
+							case *document.TextField:
+								value = string(docF.Value())
+							case *document.NumericField:
+								num, err := docF.Number()
+								if err == nil {
+									value = num
+								}
+							case *document.DateTimeField:
+								datetime, err := docF.DateTime()
+								if err == nil {
+									value = datetime.Format(time.RFC3339)
+								}
+							case *document.BooleanField:
+								boolean, err := docF.Boolean()
+								if err == nil {
+									value = boolean
+								}
+							case *document.GeoPointField:
+								lon, err := docF.Lon()
+								if err == nil {
+									lat, err := docF.Lat()
+									if err == nil {
+										value = []float64{lon, lat}
+									}
+								}
+							}
+							if value != nil {
+								hit.AddFieldValue(docF.Name(), value)
+							}
+						}
+					}
+				}
+			}
+			if highlighter != nil {
+				highlightFields := req.Highlight.Fields
+				if highlightFields == nil {
+					// add all fields with matches
+					highlightFields = make([]string, 0, len(hit.Locations))
+					for k := range hit.Locations {
+						highlightFields = append(highlightFields, k)
+					}
+				}
+				for _, hf := range highlightFields {
+					highlighter.BestFragmentsInField(hit, doc, hf, 1)
+				}
+			}
+		} else if doc == nil {
+			// unexpected case, a doc ID that was found as a search hit
+			// was unable to be found during document lookup
+			return ErrorIndexReadInconsistency
+		}
+	}
+
+	return nil
+}
+
 // Fields returns the name of all the fields this
 // Index has operated on.
 func (i *indexImpl) Fields() (fields []string, err error) {
@@ -854,3 +890,26 @@ func deDuplicate(fields []string) []string {
 	}
 	return ret
 }
+
+type searchHitSorter struct {
+	hits          search.DocumentMatchCollection
+	sort          search.SortOrder
+	cachedScoring []bool
+	cachedDesc    []bool
+}
+
+func newSearchHitSorter(sort search.SortOrder, hits search.DocumentMatchCollection) *searchHitSorter {
+	return &searchHitSorter{
+		sort:          sort,
+		hits:          hits,
+		cachedScoring: sort.CacheIsScore(),
+		cachedDesc:    sort.CacheDescending(),
+	}
+}
+
+func (m *searchHitSorter) Len() int      { return len(m.hits) }
+func (m *searchHitSorter) Swap(i, j int) { m.hits[i], m.hits[j] = m.hits[j], m.hits[i] }
+func (m *searchHitSorter) Less(i, j int) bool {
+	c := m.sort.Compare(m.cachedScoring, m.cachedDesc, m.hits[i], m.hits[j])
+	return c < 0
+}
--- a/vendor/github.com/blevesearch/bleve/mapping/document.go
+++ b/vendor/github.com/blevesearch/bleve/mapping/document.go
@@ -525,19 +525,27 @@ func (dm *DocumentMapping) processProperty(property interface{}, path []string,
 		if !propertyValue.IsNil() {
 			switch property := property.(type) {
 			case encoding.TextMarshaler:
-
-				txt, err := property.MarshalText()
-				if err == nil && subDocMapping != nil {
-					// index by explicit mapping
+				// ONLY process TextMarshaler if there is an explicit mapping
+				// AND all of the fiels are of type text
+				// OTHERWISE process field without TextMarshaler
+				if subDocMapping != nil {
+					allFieldsText := true
 					for _, fieldMapping := range subDocMapping.Fields {
-						if fieldMapping.Type == "text" {
-							fieldMapping.processString(string(txt), pathString, path, indexes, context)
+						if fieldMapping.Type != "text" {
+							allFieldsText = false
+							break
 						}
 					}
-				} else {
-					dm.walkDocument(property, path, indexes, context)
+					txt, err := property.MarshalText()
+					if err == nil && allFieldsText {
+						txtStr := string(txt)
+						for _, fieldMapping := range subDocMapping.Fields {
+							fieldMapping.processString(txtStr, pathString, path, indexes, context)
+						}
+						return
+					}
 				}
-
+				dm.walkDocument(property, path, indexes, context)
 			default:
 				dm.walkDocument(property, path, indexes, context)
 			}
--- a/vendor/github.com/blevesearch/bleve/numeric/prefix_coded.go
+++ b/vendor/github.com/blevesearch/bleve/numeric/prefix_coded.go
@@ -23,12 +23,26 @@ const ShiftStartInt64 byte = 0x20
 type PrefixCoded []byte

 func NewPrefixCodedInt64(in int64, shift uint) (PrefixCoded, error) {
+	rv, _, err := NewPrefixCodedInt64Prealloc(in, shift, nil)
+	return rv, err
+}
+
+func NewPrefixCodedInt64Prealloc(in int64, shift uint, prealloc []byte) (
+	rv PrefixCoded, preallocRest []byte, err error) {
 	if shift > 63 {
-		return nil, fmt.Errorf("cannot shift %d, must be between 0 and 63", shift)
+		return nil, prealloc, fmt.Errorf("cannot shift %d, must be between 0 and 63", shift)
 	}

 	nChars := ((63 - shift) / 7) + 1
-	rv := make(PrefixCoded, nChars+1)
+
+	size := int(nChars + 1)
+	if len(prealloc) >= size {
+		rv = PrefixCoded(prealloc[0:size])
+		preallocRest = prealloc[size:]
+	} else {
+		rv = make(PrefixCoded, size)
+	}
+
 	rv[0] = ShiftStartInt64 + byte(shift)

 	sortableBits := int64(uint64(in) ^ 0x8000000000000000)
@@ -40,7 +54,8 @@ func NewPrefixCodedInt64(in int64, shift uint) (PrefixCoded, error) {
 		nChars--
 		sortableBits = int64(uint64(sortableBits) >> 7)
 	}
-	return rv, nil
+
+	return rv, preallocRest, nil
 }

 func MustNewPrefixCodedInt64(in int64, shift uint) PrefixCoded {
--- a/vendor/github.com/blevesearch/bleve/search.go
+++ b/vendor/github.com/blevesearch/bleve/search.go
@@ -262,6 +262,8 @@ func (h *HighlightRequest) AddField(field string) {
 // result score explanations.
 // Sort describes the desired order for the results to be returned.
 // Score controls the kind of scoring performed
+// SearchAfter supports deep paging by providing a minimum sort key
+// SearchBefore supports deep paging by providing a maximum sort key
 //
 // A special field named "*" can be used to return all fields.
 type SearchRequest struct {
@@ -275,6 +277,8 @@ type SearchRequest struct {
 	Sort             search.SortOrder  `json:"sort"`
 	IncludeLocations bool              `json:"includeLocations"`
 	Score            string            `json:"score,omitempty"`
+	SearchAfter      []string          `json:"search_after"`
+	SearchBefore     []string          `json:"search_before"`
 }

 func (r *SearchRequest) Validate() error {
@@ -285,6 +289,27 @@ func (r *SearchRequest) Validate() error {
 		}
 	}

+	if r.SearchAfter != nil && r.SearchBefore != nil {
+		return fmt.Errorf("cannot use search after and search before together")
+	}
+
+	if r.SearchAfter != nil {
+		if r.From != 0 {
+			return fmt.Errorf("cannot use search after with from !=0")
+		}
+		if len(r.SearchAfter) != len(r.Sort) {
+			return fmt.Errorf("search after must have same size as sort order")
+		}
+	}
+	if r.SearchBefore != nil {
+		if r.From != 0 {
+			return fmt.Errorf("cannot use search before with from !=0")
+		}
+		if len(r.SearchBefore) != len(r.Sort) {
+			return fmt.Errorf("search before must have same size as sort order")
+		}
+	}
+
 	return r.Facets.Validate()
 }

@@ -311,6 +336,18 @@ func (r *SearchRequest) SortByCustom(order search.SortOrder) {
 	r.Sort = order
 }

+// SetSearchAfter sets the request to skip over hits with a sort
+// value less than the provided sort after key
+func (r *SearchRequest) SetSearchAfter(after []string) {
+	r.SearchAfter = after
+}
+
+// SetSearchBefore sets the request to skip over hits with a sort
+// value greater than the provided sort before key
+func (r *SearchRequest) SetSearchBefore(before []string) {
+	r.SearchBefore = before
+}
+
 // UnmarshalJSON deserializes a JSON representation of
 // a SearchRequest
 func (r *SearchRequest) UnmarshalJSON(input []byte) error {
@@ -325,6 +362,8 @@ func (r *SearchRequest) UnmarshalJSON(input []byte) error {
 		Sort             []json.RawMessage `json:"sort"`
 		IncludeLocations bool              `json:"includeLocations"`
 		Score            string            `json:"score"`
+		SearchAfter      []string          `json:"search_after"`
+		SearchBefore     []string          `json:"search_before"`
 	}

 	err := json.Unmarshal(input, &temp)
@@ -352,6 +391,8 @@ func (r *SearchRequest) UnmarshalJSON(input []byte) error {
 	r.Facets = temp.Facets
 	r.IncludeLocations = temp.IncludeLocations
 	r.Score = temp.Score
+	r.SearchAfter = temp.SearchAfter
+	r.SearchBefore = temp.SearchBefore
 	r.Query, err = query.ParseQuery(temp.Q)
 	if err != nil {
 		return err
--- a/vendor/github.com/blevesearch/bleve/search/collector/topn.go
+++ b/vendor/github.com/blevesearch/bleve/search/collector/topn.go
@@ -69,6 +69,7 @@ type TopNCollector struct {
 	lowestMatchOutsideResults *search.DocumentMatch
 	updateFieldVisitor        index.DocumentFieldTermVisitor
 	dvReader                  index.DocValueReader
+	searchAfter               *search.DocumentMatch
 }

 // CheckDoneEvery controls how frequently we check the context deadline
@@ -78,6 +79,21 @@ const CheckDoneEvery = uint64(1024)
 // skipping over the first 'skip' hits
 // ordering hits by the provided sort order
 func NewTopNCollector(size int, skip int, sort search.SortOrder) *TopNCollector {
+	return newTopNCollector(size, skip, sort)
+}
+
+// NewTopNCollector builds a collector to find the top 'size' hits
+// skipping over the first 'skip' hits
+// ordering hits by the provided sort order
+func NewTopNCollectorAfter(size int, sort search.SortOrder, after []string) *TopNCollector {
+	rv := newTopNCollector(size, 0, sort)
+	rv.searchAfter = &search.DocumentMatch{
+		Sort: after,
+	}
+	return rv
+}
+
+func newTopNCollector(size int, skip int, sort search.SortOrder) *TopNCollector {
 	hc := &TopNCollector{size: size, skip: skip, sort: sort}

 	// pre-allocate space on the store to avoid reslicing
@@ -141,6 +157,7 @@ func (hc *TopNCollector) Collect(ctx context.Context, searcher search.Searcher,
 	searchContext := &search.SearchContext{
 		DocumentMatchPool: search.NewDocumentMatchPool(backingSize+searcher.DocumentMatchPoolSize(), len(hc.sort)),
 		Collector:         hc,
+		IndexReader:       reader,
 	}

 	hc.dvReader, err = reader.DocValueReader(hc.neededFields)
@@ -265,6 +282,19 @@ func MakeTopNDocumentMatchHandler(
 			if d == nil {
 				return nil
 			}
+
+			// support search after based pagination,
+			// if this hit is <= the search after sort key
+			// we should skip it
+			if hc.searchAfter != nil {
+				// exact sort order matches use hit number to break tie
+				// but we want to allow for exact match, so we pretend
+				hc.searchAfter.HitNumber = d.HitNumber
+				if hc.sort.Compare(hc.cachedScoring, hc.cachedDesc, d, hc.searchAfter) <= 0 {
+					return nil
+				}
+			}
+
 			// optimization, we track lowest sorting hit already removed from heap
 			// with this one comparison, we can avoid all heap operations if
 			// this hit would have been added and then immediately removed
--- a/vendor/github.com/blevesearch/bleve/search/query/date_range.go
+++ b/vendor/github.com/blevesearch/bleve/search/query/date_range.go
@@ -41,6 +41,14 @@ type BleveQueryTime struct {
 	time.Time
 }

+var MinRFC3339CompatibleTime time.Time
+var MaxRFC3339CompatibleTime time.Time
+
+func init() {
+	MinRFC3339CompatibleTime, _ = time.Parse(time.RFC3339, "1677-12-01T00:00:00Z")
+	MaxRFC3339CompatibleTime, _ = time.Parse(time.RFC3339, "2262-04-11T11:59:59Z")
+}
+
 func queryTimeFromString(t string) (time.Time, error) {
 	dateTimeParser, err := cache.DateTimeParserNamed(QueryDateTimeParser)
 	if err != nil {
@@ -143,10 +151,20 @@ func (q *DateRangeQuery) parseEndpoints() (*float64, *float64, error) {
 	min := math.Inf(-1)
 	max := math.Inf(1)
 	if !q.Start.IsZero() {
-		min = numeric.Int64ToFloat64(q.Start.UnixNano())
+		if !isDatetimeCompatible(q.Start) {
+			// overflow
+			return nil, nil, fmt.Errorf("invalid/unsupported date range, start: %v", q.Start)
+		}
+		startInt64 := q.Start.UnixNano()
+		min = numeric.Int64ToFloat64(startInt64)
 	}
 	if !q.End.IsZero() {
-		max = numeric.Int64ToFloat64(q.End.UnixNano())
+		if !isDatetimeCompatible(q.End) {
+			// overflow
+			return nil, nil, fmt.Errorf("invalid/unsupported date range, end: %v", q.End)
+		}
+		endInt64 := q.End.UnixNano()
+		max = numeric.Int64ToFloat64(endInt64)
 	}

 	return &min, &max, nil
@@ -162,3 +180,12 @@ func (q *DateRangeQuery) Validate() error {
 	}
 	return nil
 }
+
+func isDatetimeCompatible(t BleveQueryTime) bool {
+	if QueryDateTimeFormat == time.RFC3339 &&
+		(t.Before(MinRFC3339CompatibleTime) || t.After(MaxRFC3339CompatibleTime)) {
+		return false
+	}
+
+	return true
+}
--- a/vendor/github.com/blevesearch/bleve/search/query/disjunction.go
+++ b/vendor/github.com/blevesearch/bleve/search/query/disjunction.go
@@ -80,12 +80,6 @@ func (q *DisjunctionQuery) Searcher(i index.IndexReader, m mapping.IndexMapping,

 	if len(ss) < 1 {
 		return searcher.NewMatchNoneSearcher(i)
-	} else if len(ss) == 1 && int(q.Min) == ss[0].Min() {
-		// apply optimization only if both conditions below are satisfied:
-		// - disjunction searcher has only 1 child searcher
-		// - parent searcher's min setting is equal to child searcher's min
-
-		return ss[0], nil
 	}

 	return searcher.NewDisjunctionSearcher(i, ss, q.Min, options)
--- a/vendor/github.com/blevesearch/bleve/search/query/geo_boundingpolygon.go
+++ b/vendor/github.com/blevesearch/bleve/search/query/geo_boundingpolygon.go
@@ -0,0 +1,94 @@
+//  Copyright (c) 2019 Couchbase, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 		http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package query
+
+import (
+	"encoding/json"
+	"fmt"
+
+	"github.com/blevesearch/bleve/geo"
+	"github.com/blevesearch/bleve/index"
+	"github.com/blevesearch/bleve/mapping"
+	"github.com/blevesearch/bleve/search"
+	"github.com/blevesearch/bleve/search/searcher"
+)
+
+type GeoBoundingPolygonQuery struct {
+	Points   []geo.Point `json:"polygon_points"`
+	FieldVal string      `json:"field,omitempty"`
+	BoostVal *Boost      `json:"boost,omitempty"`
+}
+
+func NewGeoBoundingPolygonQuery(points []geo.Point) *GeoBoundingPolygonQuery {
+	return &GeoBoundingPolygonQuery{
+		Points: points}
+}
+
+func (q *GeoBoundingPolygonQuery) SetBoost(b float64) {
+	boost := Boost(b)
+	q.BoostVal = &boost
+}
+
+func (q *GeoBoundingPolygonQuery) Boost() float64 {
+	return q.BoostVal.Value()
+}
+
+func (q *GeoBoundingPolygonQuery) SetField(f string) {
+	q.FieldVal = f
+}
+
+func (q *GeoBoundingPolygonQuery) Field() string {
+	return q.FieldVal
+}
+
+func (q *GeoBoundingPolygonQuery) Searcher(i index.IndexReader,
+	m mapping.IndexMapping, options search.SearcherOptions) (search.Searcher, error) {
+	field := q.FieldVal
+	if q.FieldVal == "" {
+		field = m.DefaultSearchField()
+	}
+
+	return searcher.NewGeoBoundedPolygonSearcher(i, q.Points, field, q.BoostVal.Value(), options)
+}
+
+func (q *GeoBoundingPolygonQuery) Validate() error {
+	return nil
+}
+
+func (q *GeoBoundingPolygonQuery) UnmarshalJSON(data []byte) error {
+	tmp := struct {
+		Points   []interface{} `json:"polygon_points"`
+		FieldVal string        `json:"field,omitempty"`
+		BoostVal *Boost        `json:"boost,omitempty"`
+	}{}
+	err := json.Unmarshal(data, &tmp)
+	if err != nil {
+		return err
+	}
+
+	q.Points = make([]geo.Point, 0, len(tmp.Points))
+	for _, i := range tmp.Points {
+		// now use our generic point parsing code from the geo package
+		lon, lat, found := geo.ExtractGeoPoint(i)
+		if !found {
+			return fmt.Errorf("geo polygon point: %v is not in a valid format", i)
+		}
+		q.Points = append(q.Points, geo.Point{Lon: lon, Lat: lat})
+	}
+
+	q.FieldVal = tmp.FieldVal
+	q.BoostVal = tmp.BoostVal
+	return nil
+}
--- a/vendor/github.com/blevesearch/bleve/search/query/query.go
+++ b/vendor/github.com/blevesearch/bleve/search/query/query.go
@@ -273,6 +273,15 @@ func ParseQuery(input []byte) (Query, error) {
 		}
 		return &rv, nil
 	}
+	_, hasPoints := tmp["polygon_points"]
+	if hasPoints {
+		var rv GeoBoundingPolygonQuery
+		err := json.Unmarshal(input, &rv)
+		if err != nil {
+			return nil, err
+		}
+		return &rv, nil
+	}
 	return nil, fmt.Errorf("unknown query type")
 }

--- a/vendor/github.com/blevesearch/bleve/search/scorer/scorer_term.go
+++ b/vendor/github.com/blevesearch/bleve/search/scorer/scorer_term.go
@@ -40,6 +40,7 @@ type TermQueryScorer struct {
 	idf                    float64
 	options                search.SearcherOptions
 	idfExplanation         *search.Explanation
+	includeScore           bool
 	queryNorm              float64
 	queryWeight            float64
 	queryWeightExplanation *search.Explanation
@@ -62,14 +63,15 @@ func (s *TermQueryScorer) Size() int {

 func NewTermQueryScorer(queryTerm []byte, queryField string, queryBoost float64, docTotal, docTerm uint64, options search.SearcherOptions) *TermQueryScorer {
 	rv := TermQueryScorer{
-		queryTerm:   string(queryTerm),
-		queryField:  queryField,
-		queryBoost:  queryBoost,
-		docTerm:     docTerm,
-		docTotal:    docTotal,
-		idf:         1.0 + math.Log(float64(docTotal)/float64(docTerm+1.0)),
-		options:     options,
-		queryWeight: 1.0,
+		queryTerm:    string(queryTerm),
+		queryField:   queryField,
+		queryBoost:   queryBoost,
+		docTerm:      docTerm,
+		docTotal:     docTotal,
+		idf:          1.0 + math.Log(float64(docTotal)/float64(docTerm+1.0)),
+		options:      options,
+		queryWeight:  1.0,
+		includeScore: options.Score != "none",
 	}

 	if options.Explain {
@@ -113,56 +115,61 @@ func (s *TermQueryScorer) SetQueryNorm(qnorm float64) {
 }

 func (s *TermQueryScorer) Score(ctx *search.SearchContext, termMatch *index.TermFieldDoc) *search.DocumentMatch {
-	var scoreExplanation *search.Explanation
-
-	// need to compute score
-	var tf float64
-	if termMatch.Freq < MaxSqrtCache {
-		tf = SqrtCache[int(termMatch.Freq)]
-	} else {
-		tf = math.Sqrt(float64(termMatch.Freq))
-	}
-	score := tf * termMatch.Norm * s.idf
-
-	if s.options.Explain {
-		childrenExplanations := make([]*search.Explanation, 3)
-		childrenExplanations[0] = &search.Explanation{
-			Value:   tf,
-			Message: fmt.Sprintf("tf(termFreq(%s:%s)=%d", s.queryField, s.queryTerm, termMatch.Freq),
+	rv := ctx.DocumentMatchPool.Get()
+	// perform any score computations only when needed
+	if s.includeScore || s.options.Explain {
+		var scoreExplanation *search.Explanation
+		var tf float64
+		if termMatch.Freq < MaxSqrtCache {
+			tf = SqrtCache[int(termMatch.Freq)]
+		} else {
+			tf = math.Sqrt(float64(termMatch.Freq))
 		}
-		childrenExplanations[1] = &search.Explanation{
-			Value:   termMatch.Norm,
-			Message: fmt.Sprintf("fieldNorm(field=%s, doc=%s)", s.queryField, termMatch.ID),
-		}
-		childrenExplanations[2] = s.idfExplanation
-		scoreExplanation = &search.Explanation{
-			Value:    score,
-			Message:  fmt.Sprintf("fieldWeight(%s:%s in %s), product of:", s.queryField, s.queryTerm, termMatch.ID),
-			Children: childrenExplanations,
-		}
-	}
+		score := tf * termMatch.Norm * s.idf

-	// if the query weight isn't 1, multiply
-	if s.queryWeight != 1.0 {
-		score = score * s.queryWeight
 		if s.options.Explain {
-			childExplanations := make([]*search.Explanation, 2)
-			childExplanations[0] = s.queryWeightExplanation
-			childExplanations[1] = scoreExplanation
+			childrenExplanations := make([]*search.Explanation, 3)
+			childrenExplanations[0] = &search.Explanation{
+				Value:   tf,
+				Message: fmt.Sprintf("tf(termFreq(%s:%s)=%d", s.queryField, s.queryTerm, termMatch.Freq),
+			}
+			childrenExplanations[1] = &search.Explanation{
+				Value:   termMatch.Norm,
+				Message: fmt.Sprintf("fieldNorm(field=%s, doc=%s)", s.queryField, termMatch.ID),
+			}
+			childrenExplanations[2] = s.idfExplanation
 			scoreExplanation = &search.Explanation{
 				Value:    score,
-				Message:  fmt.Sprintf("weight(%s:%s^%f in %s), product of:", s.queryField, s.queryTerm, s.queryBoost, termMatch.ID),
-				Children: childExplanations,
+				Message:  fmt.Sprintf("fieldWeight(%s:%s in %s), product of:", s.queryField, s.queryTerm, termMatch.ID),
+				Children: childrenExplanations,
 			}
 		}
+
+		// if the query weight isn't 1, multiply
+		if s.queryWeight != 1.0 {
+			score = score * s.queryWeight
+			if s.options.Explain {
+				childExplanations := make([]*search.Explanation, 2)
+				childExplanations[0] = s.queryWeightExplanation
+				childExplanations[1] = scoreExplanation
+				scoreExplanation = &search.Explanation{
+					Value:    score,
+					Message:  fmt.Sprintf("weight(%s:%s^%f in %s), product of:", s.queryField, s.queryTerm, s.queryBoost, termMatch.ID),
+					Children: childExplanations,
+				}
+			}
+		}
+
+		if s.includeScore {
+			rv.Score = score
+		}
+
+		if s.options.Explain {
+			rv.Expl = scoreExplanation
+		}
 	}

-	rv := ctx.DocumentMatchPool.Get()
 	rv.IndexInternalID = append(rv.IndexInternalID, termMatch.ID...)
-	rv.Score = score
-	if s.options.Explain {
-		rv.Expl = scoreExplanation
-	}

 	if len(termMatch.Vectors) > 0 {
 		if cap(rv.FieldTermLocations) < len(termMatch.Vectors) {
--- a/vendor/github.com/blevesearch/bleve/search/search.go
+++ b/vendor/github.com/blevesearch/bleve/search/search.go
@@ -17,6 +17,7 @@ package search
 import (
 	"fmt"
 	"reflect"
+	"sort"

 	"github.com/blevesearch/bleve/index"
 	"github.com/blevesearch/bleve/size"
@@ -49,6 +50,24 @@ func (ap ArrayPositions) Equals(other ArrayPositions) bool {
 	return true
 }

+func (ap ArrayPositions) Compare(other ArrayPositions) int {
+	for i, p := range ap {
+		if i >= len(other) {
+			return 1
+		}
+		if p < other[i] {
+			return -1
+		}
+		if p > other[i] {
+			return 1
+		}
+	}
+	if len(ap) < len(other) {
+		return -1
+	}
+	return 0
+}
+
 type Location struct {
 	// Pos is the position of the term within the field, starting at 1
 	Pos uint64 `json:"pos"`
@@ -68,6 +87,46 @@ func (l *Location) Size() int {

 type Locations []*Location

+func (p Locations) Len() int      { return len(p) }
+func (p Locations) Swap(i, j int) { p[i], p[j] = p[j], p[i] }
+
+func (p Locations) Less(i, j int) bool {
+	c := p[i].ArrayPositions.Compare(p[j].ArrayPositions)
+	if c < 0 {
+		return true
+	}
+	if c > 0 {
+		return false
+	}
+	return p[i].Pos < p[j].Pos
+}
+
+func (p Locations) Dedupe() Locations { // destructive!
+	if len(p) <= 1 {
+		return p
+	}
+
+	sort.Sort(p)
+
+	slow := 0
+
+	for _, pfast := range p {
+		pslow := p[slow]
+		if pslow.Pos == pfast.Pos &&
+			pslow.Start == pfast.Start &&
+			pslow.End == pfast.End &&
+			pslow.ArrayPositions.Equals(pfast.ArrayPositions) {
+			continue // duplicate, so only move fast ahead
+		}
+
+		slow++
+
+		p[slow] = pfast
+	}
+
+	return p[:slow+1]
+}
+
 type TermLocationMap map[string]Locations

 func (t TermLocationMap) AddLocation(term string, location *Location) {
@@ -208,6 +267,7 @@ func (dm *DocumentMatch) Complete(prealloc []Location) []Location {

 		var lastField string
 		var tlm TermLocationMap
+		var needsDedupe bool

 		for i, ftl := range dm.FieldTermLocations {
 			if lastField != ftl.Field {
@@ -231,7 +291,19 @@ func (dm *DocumentMatch) Complete(prealloc []Location) []Location {
 				loc.ArrayPositions = append(ArrayPositions(nil), loc.ArrayPositions...)
 			}

-			tlm[ftl.Term] = append(tlm[ftl.Term], loc)
+			locs := tlm[ftl.Term]
+
+			// if the loc is before or at the last location, then there
+			// might be duplicates that need to be deduplicated
+			if !needsDedupe && len(locs) > 0 {
+				last := locs[len(locs)-1]
+				cmp := loc.ArrayPositions.Compare(last.ArrayPositions)
+				if cmp < 0 || (cmp == 0 && loc.Pos <= last.Pos) {
+					needsDedupe = true
+				}
+			}
+
+			tlm[ftl.Term] = append(locs, loc)

 			dm.FieldTermLocations[i] = FieldTermLocation{ // recycle
 				Location: Location{
@@ -239,6 +311,14 @@ func (dm *DocumentMatch) Complete(prealloc []Location) []Location {
 				},
 			}
 		}
+
+		if needsDedupe {
+			for _, tlm := range dm.Locations {
+				for term, locs := range tlm {
+					tlm[term] = locs.Dedupe()
+				}
+			}
+		}
 	}

 	dm.FieldTermLocations = dm.FieldTermLocations[:0] // recycle
@@ -279,6 +359,7 @@ type SearcherOptions struct {
 type SearchContext struct {
 	DocumentMatchPool *DocumentMatchPool
 	Collector         Collector
+	IndexReader       index.IndexReader
 }

 func (sc *SearchContext) Size() int {
--- a/vendor/github.com/blevesearch/bleve/search/searcher/search_boolean.go
+++ b/vendor/github.com/blevesearch/bleve/search/searcher/search_boolean.go
@@ -45,6 +45,7 @@ type BooleanSearcher struct {
 	scorer          *scorer.ConjunctionQueryScorer
 	matches         []*search.DocumentMatch
 	initialized     bool
+	done            bool
 }

 func NewBooleanSearcher(indexReader index.IndexReader, mustSearcher search.Searcher, shouldSearcher search.Searcher, mustNotSearcher search.Searcher, options search.SearcherOptions) (*BooleanSearcher, error) {
@@ -207,6 +208,10 @@ func (s *BooleanSearcher) SetQueryNorm(qnorm float64) {

 func (s *BooleanSearcher) Next(ctx *search.SearchContext) (*search.DocumentMatch, error) {

+	if s.done {
+		return nil, nil
+	}
+
 	if !s.initialized {
 		err := s.initSearchers(ctx)
 		if err != nil {
@@ -320,11 +325,19 @@ func (s *BooleanSearcher) Next(ctx *search.SearchContext) (*search.DocumentMatch
 		}
 	}

+	if rv == nil {
+		s.done = true
+	}
+
 	return rv, nil
 }

 func (s *BooleanSearcher) Advance(ctx *search.SearchContext, ID index.IndexInternalID) (*search.DocumentMatch, error) {

+	if s.done {
+		return nil, nil
+	}
+
 	if !s.initialized {
 		err := s.initSearchers(ctx)
 		if err != nil {
@@ -332,14 +345,8 @@ func (s *BooleanSearcher) Advance(ctx *search.SearchContext, ID index.IndexInter
 		}
 	}

-	// Advance the searchers only if the currentID cursor is trailing the lookup ID,
-	// additionally if the mustNotSearcher has been initialized, ensure that the
-	// cursor used to track the mustNotSearcher (currMustNot, which isn't tracked by
-	// currentID) is trailing the lookup ID as well - for in the case where currentID
-	// is nil and currMustNot is already at or ahead of the lookup ID, we MUST NOT
-	// advance the currentID or the currMustNot cursors.
-	if (s.currentID == nil || s.currentID.Compare(ID) < 0) &&
-		(s.currMustNot == nil || s.currMustNot.IndexInternalID.Compare(ID) < 0) {
+	// Advance the searcher only if the cursor is trailing the lookup ID
+	if s.currentID == nil || s.currentID.Compare(ID) < 0 {
 		var err error
 		if s.mustSearcher != nil {
 			if s.currMust != nil {
@@ -362,12 +369,17 @@ func (s *BooleanSearcher) Advance(ctx *search.SearchContext, ID index.IndexInter
 		}

 		if s.mustNotSearcher != nil {
-			if s.currMustNot != nil {
-				ctx.DocumentMatchPool.Put(s.currMustNot)
-			}
-			s.currMustNot, err = s.mustNotSearcher.Advance(ctx, ID)
-			if err != nil {
-				return nil, err
+			// Additional check for mustNotSearcher, whose cursor isn't tracked by
+			// currentID to prevent it from moving when the searcher's tracked
+			// position is already ahead of or at the requested ID.
+			if s.currMustNot == nil || s.currMustNot.IndexInternalID.Compare(ID) < 0 {
+				if s.currMustNot != nil {
+					ctx.DocumentMatchPool.Put(s.currMustNot)
+				}
+				s.currMustNot, err = s.mustNotSearcher.Advance(ctx, ID)
+				if err != nil {
+					return nil, err
+				}
 			}
 		}

--- a/vendor/github.com/blevesearch/bleve/search/searcher/search_geoboundingbox.go
+++ b/vendor/github.com/blevesearch/bleve/search/searcher/search_geoboundingbox.go
@@ -22,6 +22,11 @@ import (
 	"github.com/blevesearch/bleve/search"
 )

+type filterFunc func(key []byte) bool
+
+var GeoBitsShift1 = (geo.GeoBits << 1)
+var GeoBitsShift1Minus1 = GeoBitsShift1 - 1
+
 func NewGeoBoundingBoxSearcher(indexReader index.IndexReader, minLon, minLat,
 	maxLon, maxLat float64, field string, boost float64,
 	options search.SearcherOptions, checkBoundaries bool) (
@@ -36,8 +41,11 @@ func NewGeoBoundingBoxSearcher(indexReader index.IndexReader, minLon, minLat,
 	}

 	// do math to produce list of terms needed for this search
-	onBoundaryTerms, notOnBoundaryTerms := ComputeGeoRange(0, (geo.GeoBits<<1)-1,
-		minLon, minLat, maxLon, maxLat, checkBoundaries)
+	onBoundaryTerms, notOnBoundaryTerms, err := ComputeGeoRange(0, GeoBitsShift1Minus1,
+		minLon, minLat, maxLon, maxLat, checkBoundaries, indexReader, field)
+	if err != nil {
+		return nil, err
+	}

 	var onBoundarySearcher search.Searcher
 	dvReader, err := indexReader.DocValueReader([]string{field})
@@ -94,59 +102,123 @@ var geoMaxShift = document.GeoPrecisionStep * 4
 var geoDetailLevel = ((geo.GeoBits << 1) - geoMaxShift) / 2

 func ComputeGeoRange(term uint64, shift uint,
-	sminLon, sminLat, smaxLon, smaxLat float64,
-	checkBoundaries bool) (
-	onBoundary [][]byte, notOnBoundary [][]byte) {
-	split := term | uint64(0x1)<<shift
-	var upperMax uint64
-	if shift < 63 {
-		upperMax = term | ((uint64(1) << (shift + 1)) - 1)
-	} else {
-		upperMax = 0xffffffffffffffff
-	}
-	lowerMax := split - 1
-	onBoundary, notOnBoundary = relateAndRecurse(term, lowerMax, shift,
-		sminLon, sminLat, smaxLon, smaxLat, checkBoundaries)
-	plusOnBoundary, plusNotOnBoundary := relateAndRecurse(split, upperMax, shift,
-		sminLon, sminLat, smaxLon, smaxLat, checkBoundaries)
-	onBoundary = append(onBoundary, plusOnBoundary...)
-	notOnBoundary = append(notOnBoundary, plusNotOnBoundary...)
-	return
-}
+	sminLon, sminLat, smaxLon, smaxLat float64, checkBoundaries bool,
+	indexReader index.IndexReader, field string) (
+	onBoundary [][]byte, notOnBoundary [][]byte, err error) {
+	preallocBytesLen := 32
+	preallocBytes := make([]byte, preallocBytesLen)

-func relateAndRecurse(start, end uint64, res uint,
-	sminLon, sminLat, smaxLon, smaxLat float64,
-	checkBoundaries bool) (
-	onBoundary [][]byte, notOnBoundary [][]byte) {
-	minLon := geo.MortonUnhashLon(start)
-	minLat := geo.MortonUnhashLat(start)
-	maxLon := geo.MortonUnhashLon(end)
-	maxLat := geo.MortonUnhashLat(end)
-
-	level := ((geo.GeoBits << 1) - res) >> 1
-
-	within := res%document.GeoPrecisionStep == 0 &&
-		geo.RectWithin(minLon, minLat, maxLon, maxLat,
-			sminLon, sminLat, smaxLon, smaxLat)
-	if within || (level == geoDetailLevel &&
-		geo.RectIntersects(minLon, minLat, maxLon, maxLat,
-			sminLon, sminLat, smaxLon, smaxLat)) {
-		if !within && checkBoundaries {
-			return [][]byte{
-				numeric.MustNewPrefixCodedInt64(int64(start), res),
-			}, nil
+	makePrefixCoded := func(in int64, shift uint) (rv numeric.PrefixCoded) {
+		if len(preallocBytes) <= 0 {
+			preallocBytesLen = preallocBytesLen * 2
+			preallocBytes = make([]byte, preallocBytesLen)
 		}
-		return nil,
-			[][]byte{
-				numeric.MustNewPrefixCodedInt64(int64(start), res),
-			}
-	} else if level < geoDetailLevel &&
-		geo.RectIntersects(minLon, minLat, maxLon, maxLat,
-			sminLon, sminLat, smaxLon, smaxLat) {
-		return ComputeGeoRange(start, res-1, sminLon, sminLat, smaxLon, smaxLat,
-			checkBoundaries)
+
+		rv, preallocBytes, err =
+			numeric.NewPrefixCodedInt64Prealloc(in, shift, preallocBytes)
+
+		return rv
 	}
-	return nil, nil
+
+	var fieldDict index.FieldDictContains
+	var isIndexed filterFunc
+	if irr, ok := indexReader.(index.IndexReaderContains); ok {
+		fieldDict, err = irr.FieldDictContains(field)
+		if err != nil {
+			return nil, nil, err
+		}
+
+		isIndexed = func(term []byte) bool {
+			found, err := fieldDict.Contains(term)
+			return err == nil && found
+		}
+	}
+
+	defer func() {
+		if fieldDict != nil {
+			if fd, ok := fieldDict.(index.FieldDict); ok {
+				cerr := fd.Close()
+				if cerr != nil {
+					err = cerr
+				}
+			}
+		}
+	}()
+
+	if isIndexed == nil {
+		isIndexed = func(term []byte) bool {
+			if indexReader != nil {
+				reader, err := indexReader.TermFieldReader(term, field, false, false, false)
+				if err != nil || reader == nil {
+					return false
+				}
+				if reader.Count() == 0 {
+					_ = reader.Close()
+					return false
+				}
+				_ = reader.Close()
+			}
+			return true
+		}
+	}
+
+	var computeGeoRange func(term uint64, shift uint) // declare for recursion
+
+	relateAndRecurse := func(start, end uint64, res, level uint) {
+		minLon := geo.MortonUnhashLon(start)
+		minLat := geo.MortonUnhashLat(start)
+		maxLon := geo.MortonUnhashLon(end)
+		maxLat := geo.MortonUnhashLat(end)
+
+		within := res%document.GeoPrecisionStep == 0 &&
+			geo.RectWithin(minLon, minLat, maxLon, maxLat,
+				sminLon, sminLat, smaxLon, smaxLat)
+		if within || (level == geoDetailLevel &&
+			geo.RectIntersects(minLon, minLat, maxLon, maxLat,
+				sminLon, sminLat, smaxLon, smaxLat)) {
+			codedTerm := makePrefixCoded(int64(start), res)
+			if isIndexed(codedTerm) {
+				if !within && checkBoundaries {
+					onBoundary = append(onBoundary, codedTerm)
+				} else {
+					notOnBoundary = append(notOnBoundary, codedTerm)
+				}
+			}
+		} else if level < geoDetailLevel &&
+			geo.RectIntersects(minLon, minLat, maxLon, maxLat,
+				sminLon, sminLat, smaxLon, smaxLat) {
+			computeGeoRange(start, res-1)
+		}
+	}
+
+	computeGeoRange = func(term uint64, shift uint) {
+		if err != nil {
+			return
+		}
+
+		split := term | uint64(0x1)<<shift
+		var upperMax uint64
+		if shift < 63 {
+			upperMax = term | ((uint64(1) << (shift + 1)) - 1)
+		} else {
+			upperMax = 0xffffffffffffffff
+		}
+
+		lowerMax := split - 1
+
+		level := (GeoBitsShift1 - shift) >> 1
+
+		relateAndRecurse(term, lowerMax, shift, level)
+		relateAndRecurse(split, upperMax, shift, level)
+	}
+
+	computeGeoRange(term, shift)
+
+	if err != nil {
+		return nil, nil, err
+	}
+
+	return onBoundary, notOnBoundary, err
 }

 func buildRectFilter(dvReader index.DocValueReader, field string,
--- a/vendor/github.com/blevesearch/bleve/search/searcher/search_geopointdistance.go
+++ b/vendor/github.com/blevesearch/bleve/search/searcher/search_geopointdistance.go
@@ -34,7 +34,7 @@ func NewGeoPointDistanceSearcher(indexReader index.IndexReader, centerLon,
 	// build a searcher for the box
 	boxSearcher, err := boxSearcher(indexReader,
 		topLeftLon, topLeftLat, bottomRightLon, bottomRightLat,
-		field, boost, options)
+		field, boost, options, false)
 	if err != nil {
 		return nil, err
 	}
@@ -54,19 +54,20 @@ func NewGeoPointDistanceSearcher(indexReader index.IndexReader, centerLon,
 // two boxes joined through a disjunction searcher
 func boxSearcher(indexReader index.IndexReader,
 	topLeftLon, topLeftLat, bottomRightLon, bottomRightLat float64,
-	field string, boost float64, options search.SearcherOptions) (
+	field string, boost float64, options search.SearcherOptions, checkBoundaries bool) (
 	search.Searcher, error) {
 	if bottomRightLon < topLeftLon {
 		// cross date line, rewrite as two parts

 		leftSearcher, err := NewGeoBoundingBoxSearcher(indexReader,
 			-180, bottomRightLat, bottomRightLon, topLeftLat,
-			field, boost, options, false)
+			field, boost, options, checkBoundaries)
 		if err != nil {
 			return nil, err
 		}
 		rightSearcher, err := NewGeoBoundingBoxSearcher(indexReader,
-			topLeftLon, bottomRightLat, 180, topLeftLat, field, boost, options, false)
+			topLeftLon, bottomRightLat, 180, topLeftLat, field, boost, options,
+			checkBoundaries)
 		if err != nil {
 			_ = leftSearcher.Close()
 			return nil, err
@@ -85,7 +86,7 @@ func boxSearcher(indexReader index.IndexReader,
 	// build geoboundinggox searcher for that bounding box
 	boxSearcher, err := NewGeoBoundingBoxSearcher(indexReader,
 		topLeftLon, bottomRightLat, bottomRightLon, topLeftLat, field, boost,
-		options, false)
+		options, checkBoundaries)
 	if err != nil {
 		return nil, err
 	}
--- a/vendor/github.com/blevesearch/bleve/search/searcher/search_geopolygon.go
+++ b/vendor/github.com/blevesearch/bleve/search/searcher/search_geopolygon.go
@@ -0,0 +1,110 @@
+//  Copyright (c) 2019 Couchbase, Inc.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// 		http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package searcher
+
+import (
+	"github.com/blevesearch/bleve/geo"
+	"github.com/blevesearch/bleve/index"
+	"github.com/blevesearch/bleve/numeric"
+	"github.com/blevesearch/bleve/search"
+	"math"
+)
+
+func NewGeoBoundedPolygonSearcher(indexReader index.IndexReader,
+	polygon []geo.Point, field string, boost float64,
+	options search.SearcherOptions) (search.Searcher, error) {
+
+	// compute the bounding box enclosing the polygon
+	topLeftLon, topLeftLat, bottomRightLon, bottomRightLat, err :=
+		geo.BoundingRectangleForPolygon(polygon)
+	if err != nil {
+		return nil, err
+	}
+
+	// build a searcher for the bounding box on the polygon
+	boxSearcher, err := boxSearcher(indexReader,
+		topLeftLon, topLeftLat, bottomRightLon, bottomRightLat,
+		field, boost, options, true)
+	if err != nil {
+		return nil, err
+	}
+
+	dvReader, err := indexReader.DocValueReader([]string{field})
+	if err != nil {
+		return nil, err
+	}
+
+	// wrap it in a filtering searcher that checks for the polygon inclusivity
+	return NewFilteringSearcher(boxSearcher,
+		buildPolygonFilter(dvReader, field, polygon)), nil
+}
+
+const float64EqualityThreshold = 1e-6
+
+func almostEqual(a, b float64) bool {
+	return math.Abs(a-b) <= float64EqualityThreshold
+}
+
+// buildPolygonFilter returns true if the point lies inside the
+// polygon. It is based on the ray-casting technique as referred
+// here: https://wrf.ecse.rpi.edu/nikola/pubdetails/pnpoly.html
+func buildPolygonFilter(dvReader index.DocValueReader, field string,
+	polygon []geo.Point) FilterFunc {
+	return func(d *search.DocumentMatch) bool {
+		var lon, lat float64
+		var found bool
+
+		err := dvReader.VisitDocValues(d.IndexInternalID, func(field string, term []byte) {
+			// only consider the values which are shifted 0
+			prefixCoded := numeric.PrefixCoded(term)
+			shift, err := prefixCoded.Shift()
+			if err == nil && shift == 0 {
+				i64, err := prefixCoded.Int64()
+				if err == nil {
+					lon = geo.MortonUnhashLon(uint64(i64))
+					lat = geo.MortonUnhashLat(uint64(i64))
+					found = true
+				}
+			}
+		})
+
+		// Note: this approach works for points which are strictly inside
+		// the polygon. ie it might fail for certain points on the polygon boundaries.
+		if err == nil && found {
+			nVertices := len(polygon)
+			var inside bool
+			// check for a direct vertex match
+			if almostEqual(polygon[0].Lat, lat) &&
+				almostEqual(polygon[0].Lon, lon) {
+				return true
+			}
+
+			for i := 1; i < nVertices; i++ {
+				if almostEqual(polygon[i].Lat, lat) &&
+					almostEqual(polygon[i].Lon, lon) {
+					return true
+				}
+				if (polygon[i].Lat > lat) != (polygon[i-1].Lat > lat) &&
+					lon < (polygon[i-1].Lon-polygon[i].Lon)*(lat-polygon[i].Lat)/
+						(polygon[i-1].Lat-polygon[i].Lat)+polygon[i].Lon {
+					inside = !inside
+				}
+			}
+			return inside
+
+		}
+		return false
+	}
+}
--- a/vendor/github.com/blevesearch/bleve/search/searcher/search_numeric_range.go
+++ b/vendor/github.com/blevesearch/bleve/search/searcher/search_numeric_range.go
@@ -53,20 +53,49 @@ func NewNumericRangeSearcher(indexReader index.IndexReader,
 	if !*inclusiveMax && maxInt64 != math.MinInt64 {
 		maxInt64--
 	}
+
+	var fieldDict index.FieldDictContains
+	var isIndexed filterFunc
+	var err error
+	if irr, ok := indexReader.(index.IndexReaderContains); ok {
+		fieldDict, err = irr.FieldDictContains(field)
+		if err != nil {
+			return nil, err
+		}
+
+		isIndexed = func(term []byte) bool {
+			found, err := fieldDict.Contains(term)
+			return err == nil && found
+		}
+	}
+
 	// FIXME hard-coded precision, should match field declaration
 	termRanges := splitInt64Range(minInt64, maxInt64, 4)
-	terms := termRanges.Enumerate()
+	terms := termRanges.Enumerate(isIndexed)
+	if fieldDict != nil {
+		if fd, ok := fieldDict.(index.FieldDict); ok {
+			cerr := fd.Close()
+			if cerr != nil {
+				err = cerr
+			}
+		}
+	}
+
 	if len(terms) < 1 {
 		// cannot return MatchNoneSearcher because of interaction with
 		// commit f391b991c20f02681bacd197afc6d8aed444e132
 		return NewMultiTermSearcherBytes(indexReader, terms, field, boost, options,
 			true)
 	}
-	var err error
-	terms, err = filterCandidateTerms(indexReader, terms, field)
-	if err != nil {
-		return nil, err
+
+	// for upside_down
+	if isIndexed == nil {
+		terms, err = filterCandidateTerms(indexReader, terms, field)
+		if err != nil {
+			return nil, err
+		}
 	}
+
 	if tooManyClauses(len(terms)) {
 		return nil, tooManyClausesErr(len(terms))
 	}
@@ -125,11 +154,17 @@ type termRange struct {
 	endTerm   []byte
 }

-func (t *termRange) Enumerate() [][]byte {
+func (t *termRange) Enumerate(filter filterFunc) [][]byte {
 	var rv [][]byte
 	next := t.startTerm
 	for bytes.Compare(next, t.endTerm) <= 0 {
-		rv = append(rv, next)
+		if filter != nil {
+			if filter(next) {
+				rv = append(rv, next)
+			}
+		} else {
+			rv = append(rv, next)
+		}
 		next = incrementBytes(next)
 	}
 	return rv
@@ -150,10 +185,10 @@ func incrementBytes(in []byte) []byte {

 type termRanges []*termRange

-func (tr termRanges) Enumerate() [][]byte {
+func (tr termRanges) Enumerate(filter filterFunc) [][]byte {
 	var rv [][]byte
 	for _, tri := range tr {
-		trie := tri.Enumerate()
+		trie := tri.Enumerate(filter)
 		rv = append(rv, trie...)
 	}
 	return rv
--- a/vendor/github.com/blevesearch/bleve/search/sort.go
+++ b/vendor/github.com/blevesearch/bleve/search/sort.go
@@ -38,6 +38,8 @@ type SearchSort interface {
 	RequiresScoring() bool
 	RequiresFields() []string

+	Reverse()
+
 	Copy() SearchSort
 }

@@ -293,6 +295,12 @@ func (so SortOrder) CacheDescending() []bool {
 	return rv
 }

+func (so SortOrder) Reverse() {
+	for _, soi := range so {
+		soi.Reverse()
+	}
+}
+
 // SortFieldType lets you control some internal sort behavior
 // normally leaving this to the zero-value of SortFieldAuto is fine
 type SortFieldType int
@@ -492,6 +500,15 @@ func (s *SortField) Copy() SearchSort {
 	return &rv
 }

+func (s *SortField) Reverse() {
+	s.Desc = !s.Desc
+	if s.Missing == SortFieldMissingFirst {
+		s.Missing = SortFieldMissingLast
+	} else {
+		s.Missing = SortFieldMissingFirst
+	}
+}
+
 // SortDocID will sort results by the document identifier
 type SortDocID struct {
 	Desc bool
@@ -533,6 +550,10 @@ func (s *SortDocID) Copy() SearchSort {
 	return &rv
 }

+func (s *SortDocID) Reverse() {
+	s.Desc = !s.Desc
+}
+
 // SortScore will sort results by the document match score
 type SortScore struct {
 	Desc bool
@@ -574,6 +595,10 @@ func (s *SortScore) Copy() SearchSort {
 	return &rv
 }

+func (s *SortScore) Reverse() {
+	s.Desc = !s.Desc
+}
+
 var maxDistance = string(numeric.MustNewPrefixCodedInt64(math.MaxInt64, 0))

 // NewSortGeoDistance creates SearchSort instance for sorting documents by
@@ -705,6 +730,10 @@ func (s *SortGeoDistance) Copy() SearchSort {
 	return &rv
 }

+func (s *SortGeoDistance) Reverse() {
+	s.Desc = !s.Desc
+}
+
 type BytesSlice [][]byte

 func (p BytesSlice) Len() int           { return len(p) }