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_range.go

@@ -0,0 +1,155 @@
+// 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
+
+// RangeQuery matches documents with fields that have terms within a certain range.
+//
+// For details, see
+// https://www.elastic.co/guide/en/elasticsearch/reference/7.0/query-dsl-range-query.html
+type RangeQuery struct {
+	name         string
+	from         interface{}
+	to           interface{}
+	timeZone     string
+	includeLower bool
+	includeUpper bool
+	boost        *float64
+	queryName    string
+	format       string
+	relation     string
+}
+
+// NewRangeQuery creates and initializes a new RangeQuery.
+func NewRangeQuery(name string) *RangeQuery {
+	return &RangeQuery{name: name, includeLower: true, includeUpper: true}
+}
+
+// From indicates the from part of the RangeQuery.
+// Use nil to indicate an unbounded from part.
+func (q *RangeQuery) From(from interface{}) *RangeQuery {
+	q.from = from
+	return q
+}
+
+// Gt indicates a greater-than value for the from part.
+// Use nil to indicate an unbounded from part.
+func (q *RangeQuery) Gt(from interface{}) *RangeQuery {
+	q.from = from
+	q.includeLower = false
+	return q
+}
+
+// Gte indicates a greater-than-or-equal value for the from part.
+// Use nil to indicate an unbounded from part.
+func (q *RangeQuery) Gte(from interface{}) *RangeQuery {
+	q.from = from
+	q.includeLower = true
+	return q
+}
+
+// To indicates the to part of the RangeQuery.
+// Use nil to indicate an unbounded to part.
+func (q *RangeQuery) To(to interface{}) *RangeQuery {
+	q.to = to
+	return q
+}
+
+// Lt indicates a less-than value for the to part.
+// Use nil to indicate an unbounded to part.
+func (q *RangeQuery) Lt(to interface{}) *RangeQuery {
+	q.to = to
+	q.includeUpper = false
+	return q
+}
+
+// Lte indicates a less-than-or-equal value for the to part.
+// Use nil to indicate an unbounded to part.
+func (q *RangeQuery) Lte(to interface{}) *RangeQuery {
+	q.to = to
+	q.includeUpper = true
+	return q
+}
+
+// IncludeLower indicates whether the lower bound should be included or not.
+// Defaults to true.
+func (q *RangeQuery) IncludeLower(includeLower bool) *RangeQuery {
+	q.includeLower = includeLower
+	return q
+}
+
+// IncludeUpper indicates whether the upper bound should be included or not.
+// Defaults to true.
+func (q *RangeQuery) IncludeUpper(includeUpper bool) *RangeQuery {
+	q.includeUpper = includeUpper
+	return q
+}
+
+// Boost sets the boost for this query.
+func (q *RangeQuery) Boost(boost float64) *RangeQuery {
+	q.boost = &boost
+	return q
+}
+
+// QueryName sets the query name for the filter that can be used when
+// searching for matched_filters per hit.
+func (q *RangeQuery) QueryName(queryName string) *RangeQuery {
+	q.queryName = queryName
+	return q
+}
+
+// TimeZone is used for date fields. In that case, we can adjust the
+// from/to fields using a timezone.
+func (q *RangeQuery) TimeZone(timeZone string) *RangeQuery {
+	q.timeZone = timeZone
+	return q
+}
+
+// Format is used for date fields. In that case, we can set the format
+// to be used instead of the mapper format.
+func (q *RangeQuery) Format(format string) *RangeQuery {
+	q.format = format
+	return q
+}
+
+// Relation is used for range fields. which can be one of
+// "within", "contains", "intersects" (default) and "disjoint".
+func (q *RangeQuery) Relation(relation string) *RangeQuery {
+	q.relation = relation
+	return q
+}
+
+// Source returns JSON for the query.
+func (q *RangeQuery) Source() (interface{}, error) {
+	source := make(map[string]interface{})
+
+	rangeQ := make(map[string]interface{})
+	source["range"] = rangeQ
+
+	params := make(map[string]interface{})
+	rangeQ[q.name] = params
+
+	params["from"] = q.from
+	params["to"] = q.to
+	if q.timeZone != "" {
+		params["time_zone"] = q.timeZone
+	}
+	if q.format != "" {
+		params["format"] = q.format
+	}
+	if q.relation != "" {
+		params["relation"] = q.relation
+	}
+	if q.boost != nil {
+		params["boost"] = *q.boost
+	}
+	params["include_lower"] = q.includeLower
+	params["include_upper"] = q.includeUpper
+
+	if q.queryName != "" {
+		rangeQ["_name"] = q.queryName
+	}
+
+	return source, nil
+}