Issue search support elasticsearch (#9428)

* Issue search support elasticsearch

* Fix lint

* Add indexer name on app.ini

* add a warnning on SearchIssuesByKeyword

* improve code

vendor/github.com/olivere/elastic/v7/cat_count.go

@@ -0,0 +1,215 @@
+// Copyright 2012-present Oliver Eilhard. All rights reserved.
+// Use of this source code is governed by a MIT-license.
+// See http://olivere.mit-license.org/license.txt for details.
+
+package elastic
+
+import (
+	"context"
+	"fmt"
+	"net/http"
+	"net/url"
+	"strings"
+
+	"github.com/olivere/elastic/v7/uritemplates"
+)
+
+// CatCountService provides quick access to the document count of the entire cluster,
+// or individual indices.
+//
+// See https://www.elastic.co/guide/en/elasticsearch/reference/7.0/cat-count.html
+// for details.
+type CatCountService struct {
+	client *Client
+
+	pretty     *bool       // pretty format the returned JSON response
+	human      *bool       // return human readable values for statistics
+	errorTrace *bool       // include the stack trace of returned errors
+	filterPath []string    // list of filters used to reduce the response
+	headers    http.Header // custom request-level HTTP headers
+
+	index         []string
+	local         *bool
+	masterTimeout string
+	columns       []string
+	sort          []string // list of columns for sort order
+}
+
+// NewCatCountService creates a new CatCountService.
+func NewCatCountService(client *Client) *CatCountService {
+	return &CatCountService{
+		client: client,
+	}
+}
+
+// Pretty tells Elasticsearch whether to return a formatted JSON response.
+func (s *CatCountService) Pretty(pretty bool) *CatCountService {
+	s.pretty = &pretty
+	return s
+}
+
+// Human specifies whether human readable values should be returned in
+// the JSON response, e.g. "7.5mb".
+func (s *CatCountService) Human(human bool) *CatCountService {
+	s.human = &human
+	return s
+}
+
+// ErrorTrace specifies whether to include the stack trace of returned errors.
+func (s *CatCountService) ErrorTrace(errorTrace bool) *CatCountService {
+	s.errorTrace = &errorTrace
+	return s
+}
+
+// FilterPath specifies a list of filters used to reduce the response.
+func (s *CatCountService) FilterPath(filterPath ...string) *CatCountService {
+	s.filterPath = filterPath
+	return s
+}
+
+// Header adds a header to the request.
+func (s *CatCountService) Header(name string, value string) *CatCountService {
+	if s.headers == nil {
+		s.headers = http.Header{}
+	}
+	s.headers.Add(name, value)
+	return s
+}
+
+// Headers specifies the headers of the request.
+func (s *CatCountService) Headers(headers http.Header) *CatCountService {
+	s.headers = headers
+	return s
+}
+
+// Index specifies zero or more indices for which to return counts
+// (by default counts for all indices are returned).
+func (s *CatCountService) Index(index ...string) *CatCountService {
+	s.index = index
+	return s
+}
+
+// Local indicates to return local information, i.e. do not retrieve
+// the state from master node (default: false).
+func (s *CatCountService) Local(local bool) *CatCountService {
+	s.local = &local
+	return s
+}
+
+// MasterTimeout is the explicit operation timeout for connection to master node.
+func (s *CatCountService) MasterTimeout(masterTimeout string) *CatCountService {
+	s.masterTimeout = masterTimeout
+	return s
+}
+
+// Columns to return in the response.
+// To get a list of all possible columns to return, run the following command
+// in your terminal:
+//
+// Example:
+//   curl 'http://localhost:9200/_cat/count?help'
+//
+// You can use Columns("*") to return all possible columns. That might take
+// a little longer than the default set of columns.
+func (s *CatCountService) Columns(columns ...string) *CatCountService {
+	s.columns = columns
+	return s
+}
+
+// Sort is a list of fields to sort by.
+func (s *CatCountService) Sort(fields ...string) *CatCountService {
+	s.sort = fields
+	return s
+}
+
+// buildURL builds the URL for the operation.
+func (s *CatCountService) buildURL() (string, url.Values, error) {
+	// Build URL
+	var (
+		path string
+		err  error
+	)
+
+	if len(s.index) > 0 {
+		path, err = uritemplates.Expand("/_cat/count/{index}", map[string]string{
+			"index": strings.Join(s.index, ","),
+		})
+	} else {
+		path = "/_cat/count"
+	}
+	if err != nil {
+		return "", url.Values{}, err
+	}
+
+	// Add query string parameters
+	params := url.Values{
+		"format": []string{"json"}, // always returns as JSON
+	}
+	if v := s.pretty; v != nil {
+		params.Set("pretty", fmt.Sprint(*v))
+	}
+	if v := s.human; v != nil {
+		params.Set("human", fmt.Sprint(*v))
+	}
+	if v := s.errorTrace; v != nil {
+		params.Set("error_trace", fmt.Sprint(*v))
+	}
+	if len(s.filterPath) > 0 {
+		params.Set("filter_path", strings.Join(s.filterPath, ","))
+	}
+	if v := s.local; v != nil {
+		params.Set("local", fmt.Sprint(*v))
+	}
+	if s.masterTimeout != "" {
+		params.Set("master_timeout", s.masterTimeout)
+	}
+	if len(s.sort) > 0 {
+		params.Set("s", strings.Join(s.sort, ","))
+	}
+	if len(s.columns) > 0 {
+		params.Set("h", strings.Join(s.columns, ","))
+	}
+	return path, params, nil
+}
+
+// Do executes the operation.
+func (s *CatCountService) Do(ctx context.Context) (CatCountResponse, error) {
+	// Get URL for request
+	path, params, err := s.buildURL()
+	if err != nil {
+		return nil, err
+	}
+
+	// Get HTTP response
+	res, err := s.client.PerformRequest(ctx, PerformRequestOptions{
+		Method:  "GET",
+		Path:    path,
+		Params:  params,
+		Headers: s.headers,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	// Return operation response
+	var ret CatCountResponse
+	if err := s.client.decoder.Decode(res.Body, &ret); err != nil {
+		return nil, err
+	}
+	return ret, nil
+}
+
+// -- Result of a get request.
+
+// CatCountResponse is the outcome of CatCountService.Do.
+type CatCountResponse []CatCountResponseRow
+
+// CatCountResponseRow specifies the data returned for one index
+// of a CatCountResponse. Notice that not all of these fields might
+// be filled; that depends on the number of columns chose in the
+// request (see CatCountService.Columns).
+type CatCountResponseRow struct {
+	Epoch     int64  `json:"epoch,string"` // e.g. 1527077996
+	Timestamp string `json:"timestamp"`    // e.g. "12:19:56"
+	Count     int    `json:"count,string"` // number of documents
+}