Add multi-valued test

Author: jordan-powers

modules/mapper-extras/src/yamlRestTest/resources/rest-api-spec/test/match_only_text/10_basic.yml

@@ -467,6 +467,14 @@ synthetic_source match_only_text as multi-field with ignored keyword as parent:
         body:
           foo: "Apache Lucene powers Elasticsearch"
 
+  - do:
+      index:
+        index: synthetic_source_test
+        id: "2"
+        refresh: true
+        body:
+          foo: [ "Apache Lucene powers Elasticsearch", "Apache" ]
+
   - do:
       search:
         index: synthetic_source_test
@@ -475,9 +483,11 @@ synthetic_source match_only_text as multi-field with ignored keyword as parent:
             match_phrase:
               foo.text: apache lucene
 
-  - match: { "hits.total.value": 1 }
+  - match: { "hits.total.value": 2 }
   - match:
       hits.hits.0._source.foo: "Apache Lucene powers Elasticsearch"
+  - match:
+      hits.hits.1._source.foo: [ "Apache", "Apache Lucene powers Elasticsearch" ]
 
 ---
 synthetic_source match_only_text as multi-field with stored keyword as parent: