RestClient操作索引库-初始化RestClient

1.引入es的RestHighLevelClient依赖：

<!--elasticsearch-->
<dependency>
     <groupId>org.elasticsearch.client</groupId>
     <artifactId>elasticsearch-rest-high-level-client</artifactId>
     <version>7.12.1</version>
</dependency>

2.因为SpringBoot默认的ES版本是7.6.2，所以我们需要覆盖默认的ES版本： 

3.初始化RestHighLevelClient：

return new RestHighLevelClient(RestClient.builder(
                HttpHost.create("http://192.168.150.101:9200")
));