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/search_queries_ids.go

@@ -0,0 +1,78 @@
+// 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
+
+// IdsQuery filters documents that only have the provided ids.
+// Note, this query uses the _uid field.
+//
+// For more details, see
+// https://www.elastic.co/guide/en/elasticsearch/reference/7.0/query-dsl-ids-query.html
+type IdsQuery struct {
+	types     []string
+	values    []string
+	boost     *float64
+	queryName string
+}
+
+// NewIdsQuery creates and initializes a new ids query.
+//
+// Deprecated: Types are in the process of being removed, prefer to filter on a field instead.
+func NewIdsQuery(types ...string) *IdsQuery {
+	return &IdsQuery{
+		types:  types,
+		values: make([]string, 0),
+	}
+}
+
+// Ids adds ids to the filter.
+func (q *IdsQuery) Ids(ids ...string) *IdsQuery {
+	q.values = append(q.values, ids...)
+	return q
+}
+
+// Boost sets the boost for this query.
+func (q *IdsQuery) Boost(boost float64) *IdsQuery {
+	q.boost = &boost
+	return q
+}
+
+// QueryName sets the query name for the filter.
+func (q *IdsQuery) QueryName(queryName string) *IdsQuery {
+	q.queryName = queryName
+	return q
+}
+
+// Source returns JSON for the function score query.
+func (q *IdsQuery) Source() (interface{}, error) {
+	// {
+	//	"ids" : {
+	//		"type" : "my_type",
+	//		"values" : ["1", "4", "100"]
+	//	}
+	// }
+
+	source := make(map[string]interface{})
+	query := make(map[string]interface{})
+	source["ids"] = query
+
+	// type(s)
+	if len(q.types) == 1 {
+		query["type"] = q.types[0]
+	} else if len(q.types) > 1 {
+		query["types"] = q.types
+	}
+
+	// values
+	query["values"] = q.values
+
+	if q.boost != nil {
+		query["boost"] = *q.boost
+	}
+	if q.queryName != "" {
+		query["_name"] = q.queryName
+	}
+
+	return source, nil
+}