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_freeze.go

@@ -0,0 +1,229 @@
+// 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"
+)
+
+// IndicesFreezeService freezes an index.
+//
+// See https://www.elastic.co/guide/en/elasticsearch/reference/7.0/freeze-index-api.html
+// and https://www.elastic.co/blog/creating-frozen-indices-with-the-elasticsearch-freeze-index-api
+// for details.
+type IndicesFreezeService 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
+	timeout             string
+	masterTimeout       string
+	ignoreUnavailable   *bool
+	allowNoIndices      *bool
+	expandWildcards     string
+	waitForActiveShards string
+}
+
+// NewIndicesFreezeService creates a new IndicesFreezeService.
+func NewIndicesFreezeService(client *Client) *IndicesFreezeService {
+	return &IndicesFreezeService{
+		client: client,
+	}
+}
+
+// Pretty tells Elasticsearch whether to return a formatted JSON response.
+func (s *IndicesFreezeService) Pretty(pretty bool) *IndicesFreezeService {
+	s.pretty = &pretty
+	return s
+}
+
+// Human specifies whether human readable values should be returned in
+// the JSON response, e.g. "7.5mb".
+func (s *IndicesFreezeService) Human(human bool) *IndicesFreezeService {
+	s.human = &human
+	return s
+}
+
+// ErrorTrace specifies whether to include the stack trace of returned errors.
+func (s *IndicesFreezeService) ErrorTrace(errorTrace bool) *IndicesFreezeService {
+	s.errorTrace = &errorTrace
+	return s
+}
+
+// FilterPath specifies a list of filters used to reduce the response.
+func (s *IndicesFreezeService) FilterPath(filterPath ...string) *IndicesFreezeService {
+	s.filterPath = filterPath
+	return s
+}
+
+// Header adds a header to the request.
+func (s *IndicesFreezeService) Header(name string, value string) *IndicesFreezeService {
+	if s.headers == nil {
+		s.headers = http.Header{}
+	}
+	s.headers.Add(name, value)
+	return s
+}
+
+// Headers specifies the headers of the request.
+func (s *IndicesFreezeService) Headers(headers http.Header) *IndicesFreezeService {
+	s.headers = headers
+	return s
+}
+
+// Index is the name of the index to freeze.
+func (s *IndicesFreezeService) Index(index string) *IndicesFreezeService {
+	s.index = index
+	return s
+}
+
+// Timeout allows to specify an explicit timeout.
+func (s *IndicesFreezeService) Timeout(timeout string) *IndicesFreezeService {
+	s.timeout = timeout
+	return s
+}
+
+// MasterTimeout allows to specify a timeout for connection to master.
+func (s *IndicesFreezeService) MasterTimeout(masterTimeout string) *IndicesFreezeService {
+	s.masterTimeout = masterTimeout
+	return s
+}
+
+// IgnoreUnavailable indicates whether specified concrete indices should be
+// ignored when unavailable (missing or closed).
+func (s *IndicesFreezeService) IgnoreUnavailable(ignoreUnavailable bool) *IndicesFreezeService {
+	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 *IndicesFreezeService) AllowNoIndices(allowNoIndices bool) *IndicesFreezeService {
+	s.allowNoIndices = &allowNoIndices
+	return s
+}
+
+// ExpandWildcards specifies whether to expand wildcard expression to
+// concrete indices that are open, closed or both..
+func (s *IndicesFreezeService) ExpandWildcards(expandWildcards string) *IndicesFreezeService {
+	s.expandWildcards = expandWildcards
+	return s
+}
+
+// WaitForActiveShards sets the number of active shards to wait for
+// before the operation returns.
+func (s *IndicesFreezeService) WaitForActiveShards(numShards string) *IndicesFreezeService {
+	s.waitForActiveShards = numShards
+	return s
+}
+
+// buildURL builds the URL for the operation.
+func (s *IndicesFreezeService) buildURL() (string, url.Values, error) {
+	// Build URL
+	path, err := uritemplates.Expand("/{index}/_freeze", map[string]string{
+		"index": s.index,
+	})
+	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.timeout != "" {
+		params.Set("timeout", s.timeout)
+	}
+	if s.masterTimeout != "" {
+		params.Set("master_timeout", s.masterTimeout)
+	}
+	if s.expandWildcards != "" {
+		params.Set("expand_wildcards", s.expandWildcards)
+	}
+	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)
+	}
+	if s.waitForActiveShards != "" {
+		params.Set("wait_for_active_shards", s.waitForActiveShards)
+	}
+	return path, params, nil
+}
+
+// Validate checks if the operation is valid.
+func (s *IndicesFreezeService) Validate() error {
+	var invalid []string
+	if s.index == "" {
+		invalid = append(invalid, "Index")
+	}
+	if len(invalid) > 0 {
+		return fmt.Errorf("missing required fields: %v", invalid)
+	}
+	return nil
+}
+
+// Do executes the service.
+func (s *IndicesFreezeService) Do(ctx context.Context) (*IndicesFreezeResponse, 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(IndicesFreezeResponse)
+	if err := s.client.decoder.Decode(res.Body, ret); err != nil {
+		return nil, err
+	}
+	return ret, nil
+}
+
+// IndicesFreezeResponse is the outcome of freezing an index.
+type IndicesFreezeResponse struct {
+	Shards *ShardsInfo `json:"_shards"`
+}