### Question:
QueryBuilders { static MatchAllQueryBuilder matchAll() { return new MatchAllQueryBuilder(); } private  QueryBuilders();   }### Answer:
@Test public void matchAll() throws IOException { assertEquals( "{\"match_all\":{}}", toJson( QueryBuilders.matchAll() ) ); }
@Test void matchAll() throws IOException { assertEquals("{\"match_all\":{}}", toJson(QueryBuilders.matchAll())); }