<dependency>
        <groupId>org.elasticsearch.client</groupId>
	<artifactId>elasticsearch-rest-high-level-client</artifactId>
	<version>{version}</version>
</dependency>
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  @Bean
  public RestHighLevelClient ESRestClient() {
    return new RestHighLevelClient(RestClient.builder(new HttpHost("127.0.0.1", 9200, "http")));
  }
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可能遇到的报错1：
Found interface org.elasticsearch.common.bytes.BytesReference, but class was expected

-- highlevelclient版本和es版本不一致导致，因为springboot默认会管理es的版本，很有可能和你引入的client版本不一致
在<properties>中覆盖版本即可
<elasticsearch.version>7.4.2</elasticsearch.version>
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