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/script_get.go

@@ -0,0 +1,169 @@
+// 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"
+	"strings"
+
+	"github.com/olivere/elastic/v7/uritemplates"
+)
+
+// GetScriptService reads a stored script in Elasticsearch.
+//
+// See https://www.elastic.co/guide/en/elasticsearch/reference/7.0/modules-scripting.html
+// for details.
+type GetScriptService 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
+}
+
+// NewGetScriptService creates a new GetScriptService.
+func NewGetScriptService(client *Client) *GetScriptService {
+	return &GetScriptService{
+		client: client,
+	}
+}
+
+// Pretty tells Elasticsearch whether to return a formatted JSON response.
+func (s *GetScriptService) Pretty(pretty bool) *GetScriptService {
+	s.pretty = &pretty
+	return s
+}
+
+// Human specifies whether human readable values should be returned in
+// the JSON response, e.g. "7.5mb".
+func (s *GetScriptService) Human(human bool) *GetScriptService {
+	s.human = &human
+	return s
+}
+
+// ErrorTrace specifies whether to include the stack trace of returned errors.
+func (s *GetScriptService) ErrorTrace(errorTrace bool) *GetScriptService {
+	s.errorTrace = &errorTrace
+	return s
+}
+
+// FilterPath specifies a list of filters used to reduce the response.
+func (s *GetScriptService) FilterPath(filterPath ...string) *GetScriptService {
+	s.filterPath = filterPath
+	return s
+}
+
+// Header adds a header to the request.
+func (s *GetScriptService) Header(name string, value string) *GetScriptService {
+	if s.headers == nil {
+		s.headers = http.Header{}
+	}
+	s.headers.Add(name, value)
+	return s
+}
+
+// Headers specifies the headers of the request.
+func (s *GetScriptService) Headers(headers http.Header) *GetScriptService {
+	s.headers = headers
+	return s
+}
+
+// Id is the script ID.
+func (s *GetScriptService) Id(id string) *GetScriptService {
+	s.id = id
+	return s
+}
+
+// buildURL builds the URL for the operation.
+func (s *GetScriptService) buildURL() (string, string, url.Values, error) {
+	var (
+		err    error
+		method = "GET"
+		path   string
+	)
+
+	path, err = uritemplates.Expand("/_scripts/{id}", map[string]string{
+		"id": s.id,
+	})
+	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, ","))
+	}
+	return method, path, params, nil
+}
+
+// Validate checks if the operation is valid.
+func (s *GetScriptService) Validate() error {
+	var invalid []string
+	if s.id == "" {
+		invalid = append(invalid, "Id")
+	}
+	if len(invalid) > 0 {
+		return fmt.Errorf("missing required fields: %v", invalid)
+	}
+	return nil
+}
+
+// Do executes the operation.
+func (s *GetScriptService) Do(ctx context.Context) (*GetScriptResponse, error) {
+	// Check pre-conditions
+	if err := s.Validate(); err != nil {
+		return nil, err
+	}
+
+	// Get URL for request
+	method, path, params, err := s.buildURL()
+	if err != nil {
+		return nil, err
+	}
+
+	// Get HTTP response
+	res, err := s.client.PerformRequest(ctx, PerformRequestOptions{
+		Method:  method,
+		Path:    path,
+		Params:  params,
+		Headers: s.headers,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	// Return operation response
+	ret := new(GetScriptResponse)
+	if err := s.client.decoder.Decode(res.Body, ret); err != nil {
+		return nil, err
+	}
+	return ret, nil
+}
+
+// GetScriptResponse is the result of getting a stored script
+// in Elasticsearch.
+type GetScriptResponse struct {
+	Id     string          `json:"_id"`
+	Found  bool            `json:"found"`
+	Script json.RawMessage `json:"script"`
+}