spring elastic

依赖地址（这里我们用的版本是7.1.1）：

https://mvnrepository.com/artifact/org.elasticsearch.client/elasticsearch-rest-high-level-client

对应的文档地址

https://www.elastic.co/guide/en/elasticsearch/client/java-rest/7.1/index.html

用到的文档手册

getting started > initialization