Field name = Field.builder().name("name").build();
Field _additional = Field.builder()
      .name("_additional")
      .fields(new Field[]{Field.builder().name("isConsistent").build()})
      .build();

Result<GraphQLResponse> result = client.graphQL().get()
      .withClassName("Article").withConsistencyLevel(ConsistencyLevel.ALL)
      .withFields(name, _additional)
      .run();