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/inner_hit.go

@@ -0,0 +1,170 @@
+// 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
+
+// InnerHit implements a simple join for parent/child, nested, and even
+// top-level documents in Elasticsearch.
+// It is an experimental feature for Elasticsearch versions 1.5 (or greater).
+// See http://www.elastic.co/guide/en/elasticsearch/reference/7.0/search-request-inner-hits.html
+// for documentation.
+//
+// See the tests for SearchSource, HasChildFilter, HasChildQuery,
+// HasParentFilter, HasParentQuery, NestedFilter, and NestedQuery
+// for usage examples.
+type InnerHit struct {
+	source *SearchSource
+	path   string
+	typ    string
+
+	name string
+}
+
+// NewInnerHit creates a new InnerHit.
+func NewInnerHit() *InnerHit {
+	return &InnerHit{source: NewSearchSource()}
+}
+
+func (hit *InnerHit) Path(path string) *InnerHit {
+	hit.path = path
+	return hit
+}
+
+func (hit *InnerHit) Type(typ string) *InnerHit {
+	hit.typ = typ
+	return hit
+}
+
+func (hit *InnerHit) Query(query Query) *InnerHit {
+	hit.source.Query(query)
+	return hit
+}
+
+func (hit *InnerHit) From(from int) *InnerHit {
+	hit.source.From(from)
+	return hit
+}
+
+func (hit *InnerHit) Size(size int) *InnerHit {
+	hit.source.Size(size)
+	return hit
+}
+
+func (hit *InnerHit) TrackScores(trackScores bool) *InnerHit {
+	hit.source.TrackScores(trackScores)
+	return hit
+}
+
+func (hit *InnerHit) Explain(explain bool) *InnerHit {
+	hit.source.Explain(explain)
+	return hit
+}
+
+func (hit *InnerHit) Version(version bool) *InnerHit {
+	hit.source.Version(version)
+	return hit
+}
+
+func (hit *InnerHit) StoredField(storedFieldName string) *InnerHit {
+	hit.source.StoredField(storedFieldName)
+	return hit
+}
+
+func (hit *InnerHit) StoredFields(storedFieldNames ...string) *InnerHit {
+	hit.source.StoredFields(storedFieldNames...)
+	return hit
+}
+
+func (hit *InnerHit) NoStoredFields() *InnerHit {
+	hit.source.NoStoredFields()
+	return hit
+}
+
+func (hit *InnerHit) FetchSource(fetchSource bool) *InnerHit {
+	hit.source.FetchSource(fetchSource)
+	return hit
+}
+
+func (hit *InnerHit) FetchSourceContext(fetchSourceContext *FetchSourceContext) *InnerHit {
+	hit.source.FetchSourceContext(fetchSourceContext)
+	return hit
+}
+
+func (hit *InnerHit) DocvalueFields(docvalueFields ...string) *InnerHit {
+	hit.source.DocvalueFields(docvalueFields...)
+	return hit
+}
+
+func (hit *InnerHit) DocvalueFieldsWithFormat(docvalueFields ...DocvalueField) *InnerHit {
+	hit.source.DocvalueFieldsWithFormat(docvalueFields...)
+	return hit
+}
+
+func (hit *InnerHit) DocvalueField(docvalueField string) *InnerHit {
+	hit.source.DocvalueField(docvalueField)
+	return hit
+}
+
+func (hit *InnerHit) DocvalueFieldWithFormat(docvalueField DocvalueField) *InnerHit {
+	hit.source.DocvalueFieldWithFormat(docvalueField)
+	return hit
+}
+
+func (hit *InnerHit) ScriptFields(scriptFields ...*ScriptField) *InnerHit {
+	hit.source.ScriptFields(scriptFields...)
+	return hit
+}
+
+func (hit *InnerHit) ScriptField(scriptField *ScriptField) *InnerHit {
+	hit.source.ScriptField(scriptField)
+	return hit
+}
+
+func (hit *InnerHit) Sort(field string, ascending bool) *InnerHit {
+	hit.source.Sort(field, ascending)
+	return hit
+}
+
+func (hit *InnerHit) SortWithInfo(info SortInfo) *InnerHit {
+	hit.source.SortWithInfo(info)
+	return hit
+}
+
+func (hit *InnerHit) SortBy(sorter ...Sorter) *InnerHit {
+	hit.source.SortBy(sorter...)
+	return hit
+}
+
+func (hit *InnerHit) Highlight(highlight *Highlight) *InnerHit {
+	hit.source.Highlight(highlight)
+	return hit
+}
+
+func (hit *InnerHit) Highlighter() *Highlight {
+	return hit.source.Highlighter()
+}
+
+func (hit *InnerHit) Name(name string) *InnerHit {
+	hit.name = name
+	return hit
+}
+
+func (hit *InnerHit) Source() (interface{}, error) {
+	src, err := hit.source.Source()
+	if err != nil {
+		return nil, err
+	}
+	source, ok := src.(map[string]interface{})
+	if !ok {
+		return nil, nil
+	}
+
+	// Notice that hit.typ and hit.path are not exported here.
+	// They are only used with SearchSource and serialized there.
+
+	if hit.name != "" {
+		source["name"] = hit.name
+	}
+	return source, nil
+}