단술의 잡다한 지식들

# Deprecated된 RestHighLevelClient를 대체하기 위해 ElasticsearchClient를 활용.

public static CountResponse getCountResponse(ElasticsearchClient client, Query query) {
  CountRequest countRequest = new CountRequest.Builder().query(query).build();
  try {
    return client.count(countRequest);
  } catch (IOException e) {
    e.printStackTrace();
  }
  return null;
}

※ 매개변수로 넘어오는 Query 객체는 MatchQuery, RangeQuery, BoolQuery 등.