es query string 新增 Fields 方法以支持对多个字段进行查询

pkg/es/search_queries_query_string.go

@@ -66,6 +66,12 @@ func (q *QueryStringQuery) Field(field string) *QueryStringQuery {
 	return q
 }
 
+// Field adds a field to run the query string against.
+func (q *QueryStringQuery) Fields(fields ...string) *QueryStringQuery {
+	q.fields = append(q.fields, fields...)
+	return q
+}
+
 // Type sets how multiple fields should be combined to build textual part queries,
 // e.g. "best_fields".
 func (q *QueryStringQuery) Type(typ string) *QueryStringQuery {