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/indices_get_aliases.go

@@ -0,0 +1,230 @@
+// 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"
+)
+
+// AliasesService returns the aliases associated with one or more indices, or the
+// indices associated with one or more aliases, or a combination of those filters.
+// See http://www.elastic.co/guide/en/elasticsearch/reference/7.0/indices-aliases.html.
+type AliasesService 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
+	alias []string
+}
+
+// NewAliasesService instantiates a new AliasesService.
+func NewAliasesService(client *Client) *AliasesService {
+	builder := &AliasesService{
+		client: client,
+	}
+	return builder
+}
+
+// Pretty tells Elasticsearch whether to return a formatted JSON response.
+func (s *AliasesService) Pretty(pretty bool) *AliasesService {
+	s.pretty = &pretty
+	return s
+}
+
+// Human specifies whether human readable values should be returned in
+// the JSON response, e.g. "7.5mb".
+func (s *AliasesService) Human(human bool) *AliasesService {
+	s.human = &human
+	return s
+}
+
+// ErrorTrace specifies whether to include the stack trace of returned errors.
+func (s *AliasesService) ErrorTrace(errorTrace bool) *AliasesService {
+	s.errorTrace = &errorTrace
+	return s
+}
+
+// FilterPath specifies a list of filters used to reduce the response.
+func (s *AliasesService) FilterPath(filterPath ...string) *AliasesService {
+	s.filterPath = filterPath
+	return s
+}
+
+// Header adds a header to the request.
+func (s *AliasesService) Header(name string, value string) *AliasesService {
+	if s.headers == nil {
+		s.headers = http.Header{}
+	}
+	s.headers.Add(name, value)
+	return s
+}
+
+// Headers specifies the headers of the request.
+func (s *AliasesService) Headers(headers http.Header) *AliasesService {
+	s.headers = headers
+	return s
+}
+
+// Index adds one or more indices.
+func (s *AliasesService) Index(index ...string) *AliasesService {
+	s.index = append(s.index, index...)
+	return s
+}
+
+// Alias adds one or more aliases.
+func (s *AliasesService) Alias(alias ...string) *AliasesService {
+	s.alias = append(s.alias, alias...)
+	return s
+}
+
+// buildURL builds the URL for the operation.
+func (s *AliasesService) buildURL() (string, url.Values, error) {
+	var err error
+	var path string
+
+	if len(s.index) > 0 {
+		path, err = uritemplates.Expand("/{index}/_alias/{alias}", map[string]string{
+			"index": strings.Join(s.index, ","),
+			"alias": strings.Join(s.alias, ","),
+		})
+	} else {
+		path, err = uritemplates.Expand("/_alias/{alias}", map[string]string{
+			"alias": strings.Join(s.alias, ","),
+		})
+	}
+	if err != nil {
+		return "", url.Values{}, err
+	}
+	path = strings.TrimSuffix(path, "/")
+
+	// 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, ","))
+	}
+	return path, params, nil
+}
+
+func (s *AliasesService) Do(ctx context.Context) (*AliasesResult, error) {
+	path, params, err := s.buildURL()
+	if err != nil {
+		return nil, err
+	}
+
+	// Get response
+	res, err := s.client.PerformRequest(ctx, PerformRequestOptions{
+		Method:  "GET",
+		Path:    path,
+		Params:  params,
+		Headers: s.headers,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	// {
+	//   "indexName" : {
+	//     "aliases" : {
+	//       "alias1" : { },
+	//       "alias2" : { }
+	//     }
+	//   },
+	//   "indexName2" : {
+	//     ...
+	//   },
+	// }
+	indexMap := make(map[string]struct {
+		Aliases map[string]struct {
+			IsWriteIndex bool `json:"is_write_index"`
+		} `json:"aliases"`
+	})
+	if err := s.client.decoder.Decode(res.Body, &indexMap); err != nil {
+		return nil, err
+	}
+
+	// Each (indexName, _)
+	ret := &AliasesResult{
+		Indices: make(map[string]indexResult),
+	}
+	for indexName, indexData := range indexMap {
+		if indexData.Aliases == nil {
+			continue
+		}
+
+		indexOut, found := ret.Indices[indexName]
+		if !found {
+			indexOut = indexResult{Aliases: make([]aliasResult, 0)}
+		}
+
+		// { "aliases" : { ... } }
+		for aliasName, aliasData := range indexData.Aliases {
+			aliasRes := aliasResult{AliasName: aliasName, IsWriteIndex: aliasData.IsWriteIndex}
+			indexOut.Aliases = append(indexOut.Aliases, aliasRes)
+		}
+
+		ret.Indices[indexName] = indexOut
+	}
+
+	return ret, nil
+}
+
+// -- Result of an alias request.
+
+// AliasesResult is the outcome of calling AliasesService.Do.
+type AliasesResult struct {
+	Indices map[string]indexResult
+}
+
+type indexResult struct {
+	Aliases []aliasResult
+}
+
+type aliasResult struct {
+	AliasName    string
+	IsWriteIndex bool
+}
+
+// IndicesByAlias returns all indices given a specific alias name.
+func (ar AliasesResult) IndicesByAlias(aliasName string) []string {
+	var indices []string
+	for indexName, indexInfo := range ar.Indices {
+		for _, aliasInfo := range indexInfo.Aliases {
+			if aliasInfo.AliasName == aliasName {
+				indices = append(indices, indexName)
+			}
+		}
+	}
+	return indices
+}
+
+// HasAlias returns true if the index has a specific alias.
+func (ir indexResult) HasAlias(aliasName string) bool {
+	for _, alias := range ir.Aliases {
+		if alias.AliasName == aliasName {
+			return true
+		}
+	}
+	return false
+}