===== Java API Client ======

요구사항
  * Java8 호환성
  * 7.x 호환성


===== Ref =====
  * [[https://www.youtube.com/watch?v=61MQoSFt2j0|ElasticCC: The new Elasticsearch Java Client: getting started and behind the scenes by Sylvain Wallez]]
  * https://github.com/elastic/elasticsearch-specification
  * https://github.com/elastic/elasticsearch-java