add an extra test for DerivedFieldType multiPhraseQuery

Signed-off-by: Marc Handalian <marc.handalian@gmail.com>

Author: mch2

server/src/test/java/org/opensearch/index/mapper/DerivedFieldMapperQueryTests.java

@@ -24,6 +24,7 @@
 import org.opensearch.common.lucene.Lucene;
 import org.opensearch.core.index.Index;
 import org.opensearch.geometry.Rectangle;
+import org.opensearch.index.query.MultiMatchQueryBuilder;
 import org.opensearch.index.query.QueryBuilders;
 import org.opensearch.index.query.QueryShardContext;
 import org.opensearch.index.query.TermQueryBuilder;
@@ -545,6 +546,13 @@ public void execute() {
                 topDocs = searcher.search(query, 10);
                 assertEquals(0, topDocs.totalHits.value);
 
+                // Multi Phrase Query
+                query = QueryBuilders.multiMatchQuery("GET", "object_field.nested_field.sub_field_1", "object_field.keyword_field")
+                    .type(MultiMatchQueryBuilder.Type.PHRASE)
+                    .toQuery(queryShardContext);
+                topDocs = searcher.search(query, 10);
+                assertEquals(7, topDocs.totalHits.value);
+
                 // Range queries of types - date, long and double
                 query = QueryBuilders.rangeQuery("object_field.date_field").from("2024-03-20T14:20:50").toQuery(queryShardContext);
                 topDocs = searcher.search(query, 10);