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_flush.go

@@ -0,0 +1,224 @@
+// 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"
+)
+
+// Flush allows to flush one or more indices. The flush process of an index
+// basically frees memory from the index by flushing data to the index
+// storage and clearing the internal transaction log.
+//
+// See https://www.elastic.co/guide/en/elasticsearch/reference/7.0/indices-flush.html
+// for details.
+type IndicesFlushService 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
+	force             *bool
+	waitIfOngoing     *bool
+	ignoreUnavailable *bool
+	allowNoIndices    *bool
+	expandWildcards   string
+}
+
+// NewIndicesFlushService creates a new IndicesFlushService.
+func NewIndicesFlushService(client *Client) *IndicesFlushService {
+	return &IndicesFlushService{
+		client: client,
+		index:  make([]string, 0),
+	}
+}
+
+// Pretty tells Elasticsearch whether to return a formatted JSON response.
+func (s *IndicesFlushService) Pretty(pretty bool) *IndicesFlushService {
+	s.pretty = &pretty
+	return s
+}
+
+// Human specifies whether human readable values should be returned in
+// the JSON response, e.g. "7.5mb".
+func (s *IndicesFlushService) Human(human bool) *IndicesFlushService {
+	s.human = &human
+	return s
+}
+
+// ErrorTrace specifies whether to include the stack trace of returned errors.
+func (s *IndicesFlushService) ErrorTrace(errorTrace bool) *IndicesFlushService {
+	s.errorTrace = &errorTrace
+	return s
+}
+
+// FilterPath specifies a list of filters used to reduce the response.
+func (s *IndicesFlushService) FilterPath(filterPath ...string) *IndicesFlushService {
+	s.filterPath = filterPath
+	return s
+}
+
+// Header adds a header to the request.
+func (s *IndicesFlushService) Header(name string, value string) *IndicesFlushService {
+	if s.headers == nil {
+		s.headers = http.Header{}
+	}
+	s.headers.Add(name, value)
+	return s
+}
+
+// Headers specifies the headers of the request.
+func (s *IndicesFlushService) Headers(headers http.Header) *IndicesFlushService {
+	s.headers = headers
+	return s
+}
+
+// Index is a list of index names; use `_all` or empty string for all indices.
+func (s *IndicesFlushService) Index(indices ...string) *IndicesFlushService {
+	s.index = append(s.index, indices...)
+	return s
+}
+
+// Force indicates whether a flush should be forced even if it is not
+// necessarily needed ie. if no changes will be committed to the index.
+// This is useful if transaction log IDs should be incremented even if
+// no uncommitted changes are present. (This setting can be considered as internal).
+func (s *IndicesFlushService) Force(force bool) *IndicesFlushService {
+	s.force = &force
+	return s
+}
+
+// WaitIfOngoing, if set to true, indicates that the flush operation will
+// block until the flush can be executed if another flush operation is
+// already executing. The default is false and will cause an exception
+// to be thrown on the shard level if another flush operation is already running..
+func (s *IndicesFlushService) WaitIfOngoing(waitIfOngoing bool) *IndicesFlushService {
+	s.waitIfOngoing = &waitIfOngoing
+	return s
+}
+
+// IgnoreUnavailable indicates whether specified concrete indices should be
+// ignored when unavailable (missing or closed).
+func (s *IndicesFlushService) IgnoreUnavailable(ignoreUnavailable bool) *IndicesFlushService {
+	s.ignoreUnavailable = &ignoreUnavailable
+	return s
+}
+
+// AllowNoIndices indicates whether to ignore if a wildcard indices expression
+// resolves into no concrete indices. (This includes `_all` string or when
+// no indices have been specified).
+func (s *IndicesFlushService) AllowNoIndices(allowNoIndices bool) *IndicesFlushService {
+	s.allowNoIndices = &allowNoIndices
+	return s
+}
+
+// ExpandWildcards specifies whether to expand wildcard expression to
+// concrete indices that are open, closed or both..
+func (s *IndicesFlushService) ExpandWildcards(expandWildcards string) *IndicesFlushService {
+	s.expandWildcards = expandWildcards
+	return s
+}
+
+// buildURL builds the URL for the operation.
+func (s *IndicesFlushService) buildURL() (string, url.Values, error) {
+	// Build URL
+	var err error
+	var path string
+
+	if len(s.index) > 0 {
+		path, err = uritemplates.Expand("/{index}/_flush", map[string]string{
+			"index": strings.Join(s.index, ","),
+		})
+	} else {
+		path = "/_flush"
+	}
+	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.force != nil {
+		params.Set("force", fmt.Sprintf("%v", *s.force))
+	}
+	if s.waitIfOngoing != nil {
+		params.Set("wait_if_ongoing", fmt.Sprintf("%v", *s.waitIfOngoing))
+	}
+	if s.ignoreUnavailable != nil {
+		params.Set("ignore_unavailable", fmt.Sprintf("%v", *s.ignoreUnavailable))
+	}
+	if s.allowNoIndices != nil {
+		params.Set("allow_no_indices", fmt.Sprintf("%v", *s.allowNoIndices))
+	}
+	if s.expandWildcards != "" {
+		params.Set("expand_wildcards", s.expandWildcards)
+	}
+	return path, params, nil
+}
+
+// Validate checks if the operation is valid.
+func (s *IndicesFlushService) Validate() error {
+	return nil
+}
+
+// Do executes the service.
+func (s *IndicesFlushService) Do(ctx context.Context) (*IndicesFlushResponse, 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:  "POST",
+		Path:    path,
+		Params:  params,
+		Headers: s.headers,
+	})
+	if err != nil {
+		return nil, err
+	}
+
+	// Return operation response
+	ret := new(IndicesFlushResponse)
+	if err := s.client.decoder.Decode(res.Body, ret); err != nil {
+		return nil, err
+	}
+	return ret, nil
+}
+
+// -- Result of a flush request.
+
+type IndicesFlushResponse struct {
+	Shards *ShardsInfo `json:"_shards"`
+}