Fix expectations around script fields as a consequence of #8592.

Author: jpountz

src/test/java/org/elasticsearch/script/javascript/JavaScriptScriptSearchTests.java

@@ -138,7 +138,7 @@ public void testScriptFieldUsingSource() throws Exception {
         assertThat(sObj2Arr2.get(0).toString(), equalTo("arr_value1"));
         assertThat(sObj2Arr2.get(1).toString(), equalTo("arr_value2"));
 
-        sObj2Arr2 = (List) response.getHits().getAt(0).field("s_obj2_arr2").value();
+        sObj2Arr2 = (List) response.getHits().getAt(0).field("s_obj2_arr2").values();
         assertThat(sObj2Arr2.size(), equalTo(2));
         assertThat(sObj2Arr2.get(0).toString(), equalTo("arr_value1"));
         assertThat(sObj2Arr2.get(1).toString(), equalTo("arr_value2"));