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/snapshot_delete.go

@@ -0,0 +1,154 @@
+// 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"
+	"encoding/json"
+	"fmt"
+	"net/http"
+	"net/url"
+
+	"github.com/olivere/elastic/v7/uritemplates"
+)
+
+// SnapshotDeleteService deletes a snapshot from a snapshot repository.
+// It is documented at
+// https://www.elastic.co/guide/en/elasticsearch/reference/7.0/modules-snapshots.html.
+type SnapshotDeleteService 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
+
+	repository string
+	snapshot   string
+}
+
+// NewSnapshotDeleteService creates a new SnapshotDeleteService.
+func NewSnapshotDeleteService(client *Client) *SnapshotDeleteService {
+	return &SnapshotDeleteService{
+		client: client,
+	}
+}
+
+// Pretty tells Elasticsearch whether to return a formatted JSON response.
+func (s *SnapshotDeleteService) Pretty(pretty bool) *SnapshotDeleteService {
+	s.pretty = &pretty
+	return s
+}
+
+// Human specifies whether human readable values should be returned in
+// the JSON response, e.g. "7.5mb".
+func (s *SnapshotDeleteService) Human(human bool) *SnapshotDeleteService {
+	s.human = &human
+	return s
+}
+
+// ErrorTrace specifies whether to include the stack trace of returned errors.
+func (s *SnapshotDeleteService) ErrorTrace(errorTrace bool) *SnapshotDeleteService {
+	s.errorTrace = &errorTrace
+	return s
+}
+
+// FilterPath specifies a list of filters used to reduce the response.
+func (s *SnapshotDeleteService) FilterPath(filterPath ...string) *SnapshotDeleteService {
+	s.filterPath = filterPath
+	return s
+}
+
+// Header adds a header to the request.
+func (s *SnapshotDeleteService) Header(name string, value string) *SnapshotDeleteService {
+	if s.headers == nil {
+		s.headers = http.Header{}
+	}
+	s.headers.Add(name, value)
+	return s
+}
+
+// Headers specifies the headers of the request.
+func (s *SnapshotDeleteService) Headers(headers http.Header) *SnapshotDeleteService {
+	s.headers = headers
+	return s
+}
+
+// Repository is the repository name.
+func (s *SnapshotDeleteService) Repository(repository string) *SnapshotDeleteService {
+	s.repository = repository
+	return s
+}
+
+// Snapshot is the snapshot name.
+func (s *SnapshotDeleteService) Snapshot(snapshot string) *SnapshotDeleteService {
+	s.snapshot = snapshot
+	return s
+}
+
+// buildURL builds the URL for the operation.
+func (s *SnapshotDeleteService) buildURL() (string, url.Values, error) {
+	// Build URL
+	path, err := uritemplates.Expand("/_snapshot/{repository}/{snapshot}", map[string]string{
+		"repository": s.repository,
+		"snapshot":   s.snapshot,
+	})
+	if err != nil {
+		return "", url.Values{}, err
+	}
+	return path, url.Values{}, nil
+}
+
+// Validate checks if the operation is valid.
+func (s *SnapshotDeleteService) Validate() error {
+	var invalid []string
+	if s.repository == "" {
+		invalid = append(invalid, "Repository")
+	}
+	if s.snapshot == "" {
+		invalid = append(invalid, "Snapshot")
+	}
+	if len(invalid) > 0 {
+		return fmt.Errorf("missing required fields: %v", invalid)
+	}
+	return nil
+}
+
+// Do executes the operation.
+func (s *SnapshotDeleteService) Do(ctx context.Context) (*SnapshotDeleteResponse, 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
+	}
+
+	// Get HTTP response
+	res, err := s.client.PerformRequest(ctx, PerformRequestOptions{
+		Method: "DELETE",
+		Path:   path,
+		Params: params,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	// Return operation response
+	ret := new(SnapshotDeleteResponse)
+	if err := json.Unmarshal(res.Body, ret); err != nil {
+		return nil, err
+	}
+	return ret, nil
+}
+
+// SnapshotDeleteResponse is the response of SnapshotDeleteService.Do.
+type SnapshotDeleteResponse struct {
+	Acknowledged bool `json:"acknowledged"`
+}