官网操作地址：
https://www.elastic.co/guide/en/elasticsearch/client/index.html
transport方式：
https://www.elastic.co/guide/en/elasticsearch/client/java-api/current/index.html
https://artifacts.elastic.co/javadoc/org/elasticsearch/client/elasticsearch-rest-high-level-client/7.2.1/index.html
restclient 方式：
https://www.elastic.co/guide/en/elasticsearch/client/java-rest/current/index.html
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