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/xpack_info.go

@@ -0,0 +1,225 @@
+// Copyright 2012-2018 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"
+)
+
+// XPackInfoService retrieves xpack info.
+// See https://www.elastic.co/guide/en/elasticsearch/reference/7.0/info-api.html.
+type XPackInfoService 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
+}
+
+// NewXPackInfoService creates a new XPackInfoService.
+func NewXPackInfoService(client *Client) *XPackInfoService {
+	return &XPackInfoService{
+		client: client,
+	}
+}
+
+// Pretty tells Elasticsearch whether to return a formatted JSON response.
+func (s *XPackInfoService) Pretty(pretty bool) *XPackInfoService {
+	s.pretty = &pretty
+	return s
+}
+
+// Human specifies whether human readable values should be returned in
+// the JSON response, e.g. "7.5mb".
+func (s *XPackInfoService) Human(human bool) *XPackInfoService {
+	s.human = &human
+	return s
+}
+
+// ErrorTrace specifies whether to include the stack trace of returned errors.
+func (s *XPackInfoService) ErrorTrace(errorTrace bool) *XPackInfoService {
+	s.errorTrace = &errorTrace
+	return s
+}
+
+// FilterPath specifies a list of filters used to reduce the response.
+func (s *XPackInfoService) FilterPath(filterPath ...string) *XPackInfoService {
+	s.filterPath = filterPath
+	return s
+}
+
+// Header adds a header to the request.
+func (s *XPackInfoService) Header(name string, value string) *XPackInfoService {
+	if s.headers == nil {
+		s.headers = http.Header{}
+	}
+	s.headers.Add(name, value)
+	return s
+}
+
+// Headers specifies the headers of the request.
+func (s *XPackInfoService) Headers(headers http.Header) *XPackInfoService {
+	s.headers = headers
+	return s
+}
+
+// buildURL builds the URL for the operation.
+func (s *XPackInfoService) buildURL() (string, url.Values, error) {
+	// Build URL
+	path, err := uritemplates.Expand("/_xpack", map[string]string{})
+	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 path, params, nil
+}
+
+// Validate checks if the operation is valid.
+func (s *XPackInfoService) Validate() error {
+	var invalid []string
+	if len(invalid) > 0 {
+		return fmt.Errorf("missing required fields: %v", invalid)
+	}
+	return nil
+}
+
+// Do executes the operation.
+func (s *XPackInfoService) Do(ctx context.Context) (*XPackInfoServiceResponse, 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:  "GET",
+		Path:    path,
+		Params:  params,
+		Headers: s.headers,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	// Return operation response
+	ret := XPackInfoServiceResponse{}
+	if err := json.Unmarshal(res.Body, &ret); err != nil {
+		return nil, err
+	}
+	return &ret, nil
+}
+
+// XPackInfoServiceResponse is the response of XPackInfoService.Do.
+type XPackInfoServiceResponse struct {
+	Build    XPackInfoBuild    `json:"build"`
+	License  XPackInfoLicense  `json:"license"`
+	Features XPackInfoFeatures `json:"features"`
+	Tagline  string            `json:"tagline"`
+}
+
+// XPackInfoBuild is the xpack build info
+type XPackInfoBuild struct {
+	Hash string `json:"hash"`
+	Date string `json:"date"`
+}
+
+// XPackInfoLicense is the xpack license info
+type XPackInfoLicense struct {
+	UID         string `json:"uid"`
+	Type        string `json:"type"`
+	Mode        string `json:"mode"`
+	Status      string `json:"status"`
+	ExpiryMilis int    `json:"expiry_date_in_millis"`
+}
+
+// XPackInfoFeatures is the xpack feature info object
+type XPackInfoFeatures struct {
+	Graph           XPackInfoGraph      `json:"graph"`
+	Logstash        XPackInfoLogstash   `json:"logstash"`
+	MachineLearning XPackInfoML         `json:"ml"`
+	Monitoring      XPackInfoMonitoring `json:"monitoring"`
+	Rollup          XPackInfoRollup     `json:"rollup"`
+	Security        XPackInfoSecurity   `json:"security"`
+	Watcher         XPackInfoWatcher    `json:"watcher"`
+}
+
+// XPackInfoGraph is the xpack graph plugin info
+type XPackInfoGraph struct {
+	Description string `json:"description"`
+	Available   bool   `json:"available"`
+	Enabled     bool   `json:"enabled"`
+}
+
+// XPackInfoLogstash is the xpack logstash plugin info
+type XPackInfoLogstash struct {
+	Description string `json:"description"`
+	Available   bool   `json:"available"`
+	Enabled     bool   `json:"enabled"`
+}
+
+// XPackInfoML is the xpack machine learning plugin info
+type XPackInfoML struct {
+	Description    string            `json:"description"`
+	Available      bool              `json:"available"`
+	Enabled        bool              `json:"enabled"`
+	NativeCodeInfo map[string]string `json:"native_code_info"`
+}
+
+// XPackInfoMonitoring is the xpack monitoring plugin info
+type XPackInfoMonitoring struct {
+	Description string `json:"description"`
+	Available   bool   `json:"available"`
+	Enabled     bool   `json:"enabled"`
+}
+
+// XPackInfoRollup is the xpack rollup plugin info
+type XPackInfoRollup struct {
+	Description string `json:"description"`
+	Available   bool   `json:"available"`
+	Enabled     bool   `json:"enabled"`
+}
+
+// XPackInfoSecurity is the xpack security plugin info
+type XPackInfoSecurity struct {
+	Description string `json:"description"`
+	Available   bool   `json:"available"`
+	Enabled     bool   `json:"enabled"`
+}
+
+// XPackInfoWatcher is the xpack watcher plugin info
+type XPackInfoWatcher struct {
+	Description string `json:"description"`
+	Available   bool   `json:"available"`
+	Enabled     bool   `json:"enabled"`
+}