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/termvectors.go

@@ -0,0 +1,520 @@
+// 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"
+)
+
+// TermvectorsService returns information and statistics on terms in the
+// fields of a particular document. The document could be stored in the
+// index or artificially provided by the user.
+//
+// See https://www.elastic.co/guide/en/elasticsearch/reference/7.0/docs-termvectors.html
+// for documentation.
+type TermvectorsService 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
+
+	id               string
+	index            string
+	typ              string
+	dfs              *bool
+	doc              interface{}
+	fieldStatistics  *bool
+	fields           []string
+	filter           *TermvectorsFilterSettings
+	perFieldAnalyzer map[string]string
+	offsets          *bool
+	parent           string
+	payloads         *bool
+	positions        *bool
+	preference       string
+	realtime         *bool
+	routing          string
+	termStatistics   *bool
+	version          interface{}
+	versionType      string
+	bodyJson         interface{}
+	bodyString       string
+}
+
+// NewTermvectorsService creates a new TermvectorsService.
+func NewTermvectorsService(client *Client) *TermvectorsService {
+	return &TermvectorsService{
+		client: client,
+	}
+}
+
+// Pretty tells Elasticsearch whether to return a formatted JSON response.
+func (s *TermvectorsService) Pretty(pretty bool) *TermvectorsService {
+	s.pretty = &pretty
+	return s
+}
+
+// Human specifies whether human readable values should be returned in
+// the JSON response, e.g. "7.5mb".
+func (s *TermvectorsService) Human(human bool) *TermvectorsService {
+	s.human = &human
+	return s
+}
+
+// ErrorTrace specifies whether to include the stack trace of returned errors.
+func (s *TermvectorsService) ErrorTrace(errorTrace bool) *TermvectorsService {
+	s.errorTrace = &errorTrace
+	return s
+}
+
+// FilterPath specifies a list of filters used to reduce the response.
+func (s *TermvectorsService) FilterPath(filterPath ...string) *TermvectorsService {
+	s.filterPath = filterPath
+	return s
+}
+
+// Header adds a header to the request.
+func (s *TermvectorsService) Header(name string, value string) *TermvectorsService {
+	if s.headers == nil {
+		s.headers = http.Header{}
+	}
+	s.headers.Add(name, value)
+	return s
+}
+
+// Headers specifies the headers of the request.
+func (s *TermvectorsService) Headers(headers http.Header) *TermvectorsService {
+	s.headers = headers
+	return s
+}
+
+// Index in which the document resides.
+func (s *TermvectorsService) Index(index string) *TermvectorsService {
+	s.index = index
+	return s
+}
+
+// Type of the document.
+//
+// Deprecated: Types are in the process of being removed.
+func (s *TermvectorsService) Type(typ string) *TermvectorsService {
+	s.typ = typ
+	return s
+}
+
+// Id of the document.
+func (s *TermvectorsService) Id(id string) *TermvectorsService {
+	s.id = id
+	return s
+}
+
+// Dfs specifies if distributed frequencies should be returned instead
+// shard frequencies.
+func (s *TermvectorsService) Dfs(dfs bool) *TermvectorsService {
+	s.dfs = &dfs
+	return s
+}
+
+// Doc is the document to analyze.
+func (s *TermvectorsService) Doc(doc interface{}) *TermvectorsService {
+	s.doc = doc
+	return s
+}
+
+// FieldStatistics specifies if document count, sum of document frequencies
+// and sum of total term frequencies should be returned.
+func (s *TermvectorsService) FieldStatistics(fieldStatistics bool) *TermvectorsService {
+	s.fieldStatistics = &fieldStatistics
+	return s
+}
+
+// Fields a list of fields to return.
+func (s *TermvectorsService) Fields(fields ...string) *TermvectorsService {
+	if s.fields == nil {
+		s.fields = make([]string, 0)
+	}
+	s.fields = append(s.fields, fields...)
+	return s
+}
+
+// Filter adds terms filter settings.
+func (s *TermvectorsService) Filter(filter *TermvectorsFilterSettings) *TermvectorsService {
+	s.filter = filter
+	return s
+}
+
+// PerFieldAnalyzer allows to specify a different analyzer than the one
+// at the field.
+func (s *TermvectorsService) PerFieldAnalyzer(perFieldAnalyzer map[string]string) *TermvectorsService {
+	s.perFieldAnalyzer = perFieldAnalyzer
+	return s
+}
+
+// Offsets specifies if term offsets should be returned.
+func (s *TermvectorsService) Offsets(offsets bool) *TermvectorsService {
+	s.offsets = &offsets
+	return s
+}
+
+// Parent id of documents.
+func (s *TermvectorsService) Parent(parent string) *TermvectorsService {
+	s.parent = parent
+	return s
+}
+
+// Payloads specifies if term payloads should be returned.
+func (s *TermvectorsService) Payloads(payloads bool) *TermvectorsService {
+	s.payloads = &payloads
+	return s
+}
+
+// Positions specifies if term positions should be returned.
+func (s *TermvectorsService) Positions(positions bool) *TermvectorsService {
+	s.positions = &positions
+	return s
+}
+
+// Preference specify the node or shard the operation
+// should be performed on (default: random).
+func (s *TermvectorsService) Preference(preference string) *TermvectorsService {
+	s.preference = preference
+	return s
+}
+
+// Realtime specifies if request is real-time as opposed to
+// near-real-time (default: true).
+func (s *TermvectorsService) Realtime(realtime bool) *TermvectorsService {
+	s.realtime = &realtime
+	return s
+}
+
+// Routing is a specific routing value.
+func (s *TermvectorsService) Routing(routing string) *TermvectorsService {
+	s.routing = routing
+	return s
+}
+
+// TermStatistics specifies if total term frequency and document frequency
+// should be returned.
+func (s *TermvectorsService) TermStatistics(termStatistics bool) *TermvectorsService {
+	s.termStatistics = &termStatistics
+	return s
+}
+
+// Version an explicit version number for concurrency control.
+func (s *TermvectorsService) Version(version interface{}) *TermvectorsService {
+	s.version = version
+	return s
+}
+
+// VersionType specifies a version type ("internal", "external", or "external_gte").
+func (s *TermvectorsService) VersionType(versionType string) *TermvectorsService {
+	s.versionType = versionType
+	return s
+}
+
+// BodyJson defines the body parameters. See documentation.
+func (s *TermvectorsService) BodyJson(body interface{}) *TermvectorsService {
+	s.bodyJson = body
+	return s
+}
+
+// BodyString defines the body parameters as a string. See documentation.
+func (s *TermvectorsService) BodyString(body string) *TermvectorsService {
+	s.bodyString = body
+	return s
+}
+
+// buildURL builds the URL for the operation.
+func (s *TermvectorsService) buildURL() (string, url.Values, error) {
+	var pathParam = map[string]string{
+		"index": s.index,
+	}
+	path := "/{index}"
+	var err error
+
+	if s.typ != "" {
+		pathParam["type"] = s.typ
+		path += "/{type}"
+	} else {
+		path += "/_termvectors"
+	}
+	if s.id != "" {
+		pathParam["id"] = s.id
+		path += "/{id}"
+	}
+	if s.typ != "" {
+		path += "/_termvectors"
+	}
+
+	path, err = uritemplates.Expand(path, pathParam)
+	if err != nil {
+		return "", url.Values{}, err
+	}
+
+	// Add query string parameters
+	params := url.Values{}
+	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.dfs; v != nil {
+		params.Set("dfs", fmt.Sprint(*v))
+	}
+	if v := s.fieldStatistics; v != nil {
+		params.Set("field_statistics", fmt.Sprint(*v))
+	}
+	if len(s.fields) > 0 {
+		params.Set("fields", strings.Join(s.fields, ","))
+	}
+	if v := s.offsets; v != nil {
+		params.Set("offsets", fmt.Sprint(*v))
+	}
+	if s.parent != "" {
+		params.Set("parent", s.parent)
+	}
+	if v := s.payloads; v != nil {
+		params.Set("payloads", fmt.Sprint(*v))
+	}
+	if v := s.positions; v != nil {
+		params.Set("positions", fmt.Sprint(*v))
+	}
+	if s.preference != "" {
+		params.Set("preference", s.preference)
+	}
+	if v := s.realtime; v != nil {
+		params.Set("realtime", fmt.Sprint(*v))
+	}
+	if s.routing != "" {
+		params.Set("routing", s.routing)
+	}
+	if v := s.termStatistics; v != nil {
+		params.Set("term_statistics", fmt.Sprint(*v))
+	}
+	if s.version != nil {
+		params.Set("version", fmt.Sprintf("%v", s.version))
+	}
+	if s.versionType != "" {
+		params.Set("version_type", s.versionType)
+	}
+	return path, params, nil
+}
+
+// Validate checks if the operation is valid.
+func (s *TermvectorsService) Validate() error {
+	var invalid []string
+	if s.index == "" {
+		invalid = append(invalid, "Index")
+	}
+	if len(invalid) > 0 {
+		return fmt.Errorf("missing required fields: %v", invalid)
+	}
+	return nil
+}
+
+// Do executes the operation.
+func (s *TermvectorsService) Do(ctx context.Context) (*TermvectorsResponse, error) {
+	// Check pre-conditions
+	if err := s.Validate(); err != nil {
+		return nil, err
+	}
+
+	// Get URL for request
+	path, params, err := s.buildURL()
+	if err != nil {
+		return nil, err
+	}
+
+	// Setup HTTP request body
+	var body interface{}
+	if s.bodyJson != nil {
+		body = s.bodyJson
+	} else if s.bodyString != "" {
+		body = s.bodyString
+	} else {
+		data := make(map[string]interface{})
+		if s.doc != nil {
+			data["doc"] = s.doc
+		}
+		if len(s.perFieldAnalyzer) > 0 {
+			data["per_field_analyzer"] = s.perFieldAnalyzer
+		}
+		if s.filter != nil {
+			src, err := s.filter.Source()
+			if err != nil {
+				return nil, err
+			}
+			data["filter"] = src
+		}
+		if len(data) > 0 {
+			body = data
+		}
+	}
+
+	// Get HTTP response
+	res, err := s.client.PerformRequest(ctx, PerformRequestOptions{
+		Method:  "GET",
+		Path:    path,
+		Params:  params,
+		Body:    body,
+		Headers: s.headers,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	// Return operation response
+	ret := new(TermvectorsResponse)
+	if err := s.client.decoder.Decode(res.Body, ret); err != nil {
+		return nil, err
+	}
+	return ret, nil
+}
+
+// -- Filter settings --
+
+// TermvectorsFilterSettings adds additional filters to a Termsvector request.
+// It allows to filter terms based on their tf-idf scores.
+// See https://www.elastic.co/guide/en/elasticsearch/reference/7.0/docs-termvectors.html#_terms_filtering
+// for more information.
+type TermvectorsFilterSettings struct {
+	maxNumTerms   *int64
+	minTermFreq   *int64
+	maxTermFreq   *int64
+	minDocFreq    *int64
+	maxDocFreq    *int64
+	minWordLength *int64
+	maxWordLength *int64
+}
+
+// NewTermvectorsFilterSettings creates and initializes a new TermvectorsFilterSettings struct.
+func NewTermvectorsFilterSettings() *TermvectorsFilterSettings {
+	return &TermvectorsFilterSettings{}
+}
+
+// MaxNumTerms specifies the maximum number of terms the must be returned per field.
+func (fs *TermvectorsFilterSettings) MaxNumTerms(value int64) *TermvectorsFilterSettings {
+	fs.maxNumTerms = &value
+	return fs
+}
+
+// MinTermFreq ignores words with less than this frequency in the source doc.
+func (fs *TermvectorsFilterSettings) MinTermFreq(value int64) *TermvectorsFilterSettings {
+	fs.minTermFreq = &value
+	return fs
+}
+
+// MaxTermFreq ignores words with more than this frequency in the source doc.
+func (fs *TermvectorsFilterSettings) MaxTermFreq(value int64) *TermvectorsFilterSettings {
+	fs.maxTermFreq = &value
+	return fs
+}
+
+// MinDocFreq ignores terms which do not occur in at least this many docs.
+func (fs *TermvectorsFilterSettings) MinDocFreq(value int64) *TermvectorsFilterSettings {
+	fs.minDocFreq = &value
+	return fs
+}
+
+// MaxDocFreq ignores terms which occur in more than this many docs.
+func (fs *TermvectorsFilterSettings) MaxDocFreq(value int64) *TermvectorsFilterSettings {
+	fs.maxDocFreq = &value
+	return fs
+}
+
+// MinWordLength specifies the minimum word length below which words will be ignored.
+func (fs *TermvectorsFilterSettings) MinWordLength(value int64) *TermvectorsFilterSettings {
+	fs.minWordLength = &value
+	return fs
+}
+
+// MaxWordLength specifies the maximum word length above which words will be ignored.
+func (fs *TermvectorsFilterSettings) MaxWordLength(value int64) *TermvectorsFilterSettings {
+	fs.maxWordLength = &value
+	return fs
+}
+
+// Source returns JSON for the query.
+func (fs *TermvectorsFilterSettings) Source() (interface{}, error) {
+	source := make(map[string]interface{})
+	if fs.maxNumTerms != nil {
+		source["max_num_terms"] = *fs.maxNumTerms
+	}
+	if fs.minTermFreq != nil {
+		source["min_term_freq"] = *fs.minTermFreq
+	}
+	if fs.maxTermFreq != nil {
+		source["max_term_freq"] = *fs.maxTermFreq
+	}
+	if fs.minDocFreq != nil {
+		source["min_doc_freq"] = *fs.minDocFreq
+	}
+	if fs.maxDocFreq != nil {
+		source["max_doc_freq"] = *fs.maxDocFreq
+	}
+	if fs.minWordLength != nil {
+		source["min_word_length"] = *fs.minWordLength
+	}
+	if fs.maxWordLength != nil {
+		source["max_word_length"] = *fs.maxWordLength
+	}
+	return source, nil
+}
+
+// -- Response types --
+
+type TokenInfo struct {
+	StartOffset int64  `json:"start_offset"`
+	EndOffset   int64  `json:"end_offset"`
+	Position    int64  `json:"position"`
+	Payload     string `json:"payload"`
+}
+
+type TermsInfo struct {
+	DocFreq  int64       `json:"doc_freq"`
+	Score    float64     `json:"score"`
+	TermFreq int64       `json:"term_freq"`
+	Ttf      int64       `json:"ttf"`
+	Tokens   []TokenInfo `json:"tokens"`
+}
+
+type FieldStatistics struct {
+	DocCount   int64 `json:"doc_count"`
+	SumDocFreq int64 `json:"sum_doc_freq"`
+	SumTtf     int64 `json:"sum_ttf"`
+}
+
+type TermVectorsFieldInfo struct {
+	FieldStatistics FieldStatistics      `json:"field_statistics"`
+	Terms           map[string]TermsInfo `json:"terms"`
+}
+
+// TermvectorsResponse is the response of TermvectorsService.Do.
+type TermvectorsResponse struct {
+	Index       string                          `json:"_index"`
+	Type        string                          `json:"_type"`
+	Id          string                          `json:"_id,omitempty"`
+	Version     int                             `json:"_version"`
+	Found       bool                            `json:"found"`
+	Took        int64                           `json:"took"`
+	TermVectors map[string]TermVectorsFieldInfo `json:"term_vectors"`
+}