HSEARCH-3860 Fix an incorrect storage for a supposedly nested object …

…field in DistanceSearchSortBaseIT

integrationtest/backend/tck/src/main/java/org/hibernate/search/integrationtest/backend/tck/search/sort/DistanceSearchSortBaseIT.java

@@ -201,7 +201,7 @@ private static class IndexMapping extends AbstractObjectMapping {
 			flattenedObject = FirstLevelObjectMapping.create( root, "flattenedObject",
 					ObjectFieldStorage.FLATTENED );
 			nestedObject = FirstLevelObjectMapping.create( root, "nestedObject",
-					ObjectFieldStorage.FLATTENED );
+					ObjectFieldStorage.NESTED );
 		}
 	}