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/exists.go

@@ -0,0 +1,236 @@
+// 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"
+)
+
+// ExistsService checks for the existence of a document using HEAD.
+//
+// See https://www.elastic.co/guide/en/elasticsearch/reference/7.0/docs-get.html
+// for details.
+type ExistsService 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
+	preference string
+	realtime   *bool
+	refresh    string
+	routing    string
+	parent     string
+}
+
+// NewExistsService creates a new ExistsService.
+func NewExistsService(client *Client) *ExistsService {
+	return &ExistsService{
+		client: client,
+		typ:    "_doc",
+	}
+}
+
+// Pretty tells Elasticsearch whether to return a formatted JSON response.
+func (s *ExistsService) Pretty(pretty bool) *ExistsService {
+	s.pretty = &pretty
+	return s
+}
+
+// Human specifies whether human readable values should be returned in
+// the JSON response, e.g. "7.5mb".
+func (s *ExistsService) Human(human bool) *ExistsService {
+	s.human = &human
+	return s
+}
+
+// ErrorTrace specifies whether to include the stack trace of returned errors.
+func (s *ExistsService) ErrorTrace(errorTrace bool) *ExistsService {
+	s.errorTrace = &errorTrace
+	return s
+}
+
+// FilterPath specifies a list of filters used to reduce the response.
+func (s *ExistsService) FilterPath(filterPath ...string) *ExistsService {
+	s.filterPath = filterPath
+	return s
+}
+
+// Header adds a header to the request.
+func (s *ExistsService) Header(name string, value string) *ExistsService {
+	if s.headers == nil {
+		s.headers = http.Header{}
+	}
+	s.headers.Add(name, value)
+	return s
+}
+
+// Headers specifies the headers of the request.
+func (s *ExistsService) Headers(headers http.Header) *ExistsService {
+	s.headers = headers
+	return s
+}
+
+// Id is the document ID.
+func (s *ExistsService) Id(id string) *ExistsService {
+	s.id = id
+	return s
+}
+
+// Index is the name of the index.
+func (s *ExistsService) Index(index string) *ExistsService {
+	s.index = index
+	return s
+}
+
+// Type is the type of the document (use `_all` to fetch the first document
+// matching the ID across all types).
+func (s *ExistsService) Type(typ string) *ExistsService {
+	s.typ = typ
+	return s
+}
+
+// Preference specifies the node or shard the operation should be performed on (default: random).
+func (s *ExistsService) Preference(preference string) *ExistsService {
+	s.preference = preference
+	return s
+}
+
+// Realtime specifies whether to perform the operation in realtime or search mode.
+func (s *ExistsService) Realtime(realtime bool) *ExistsService {
+	s.realtime = &realtime
+	return s
+}
+
+// Refresh the shard containing the document before performing the operation.
+//
+// See https://www.elastic.co/guide/en/elasticsearch/reference/7.0/docs-refresh.html
+// for details.
+func (s *ExistsService) Refresh(refresh string) *ExistsService {
+	s.refresh = refresh
+	return s
+}
+
+// Routing is a specific routing value.
+func (s *ExistsService) Routing(routing string) *ExistsService {
+	s.routing = routing
+	return s
+}
+
+// Parent is the ID of the parent document.
+func (s *ExistsService) Parent(parent string) *ExistsService {
+	s.parent = parent
+	return s
+}
+
+// buildURL builds the URL for the operation.
+func (s *ExistsService) buildURL() (string, url.Values, error) {
+	// Build URL
+	path, err := uritemplates.Expand("/{index}/{type}/{id}", map[string]string{
+		"id":    s.id,
+		"index": s.index,
+		"type":  s.typ,
+	})
+	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 s.realtime != nil {
+		params.Set("realtime", fmt.Sprint(*s.realtime))
+	}
+	if s.refresh != "" {
+		params.Set("refresh", s.refresh)
+	}
+	if s.routing != "" {
+		params.Set("routing", s.routing)
+	}
+	if s.parent != "" {
+		params.Set("parent", s.parent)
+	}
+	if s.preference != "" {
+		params.Set("preference", s.preference)
+	}
+	return path, params, nil
+}
+
+// Validate checks if the operation is valid.
+func (s *ExistsService) Validate() error {
+	var invalid []string
+	if s.id == "" {
+		invalid = append(invalid, "Id")
+	}
+	if s.index == "" {
+		invalid = append(invalid, "Index")
+	}
+	if s.typ == "" {
+		invalid = append(invalid, "Type")
+	}
+	if len(invalid) > 0 {
+		return fmt.Errorf("missing required fields: %v", invalid)
+	}
+	return nil
+}
+
+// Do executes the operation.
+func (s *ExistsService) Do(ctx context.Context) (bool, error) {
+	// Check pre-conditions
+	if err := s.Validate(); err != nil {
+		return false, err
+	}
+
+	// Get URL for request
+	path, params, err := s.buildURL()
+	if err != nil {
+		return false, err
+	}
+
+	// Get HTTP response
+	res, err := s.client.PerformRequest(ctx, PerformRequestOptions{
+		Method:       "HEAD",
+		Path:         path,
+		Params:       params,
+		IgnoreErrors: []int{404},
+		Headers:      s.headers,
+	})
+	if err != nil {
+		return false, err
+	}
+
+	// Return operation response
+	switch res.StatusCode {
+	case http.StatusOK:
+		return true, nil
+	case http.StatusNotFound:
+		return false, nil
+	default:
+		return false, fmt.Errorf("elastic: got HTTP code %d when it should have been either 200 or 404", res.StatusCode)
+	}
+}