java.lang.NoSuchMethodError: org.elasticsearch.client.RestClient.performRequest(Ljava/lang/String；Lj

es创建索引时，报：

java.lang.NoSuchMethodError: org.elasticsearch.client.RestClient.performRequest(Ljava/lang/String;Ljava/lang/String;Ljava/util/Map;Lorg/apache/http/HttpEntity;[Lorg/apache/http/Header;)Lorg/elasticsearch/client/Response;

原因：

elasticsearch-rest-high-level-client:6.3.2依赖于elasticsearch-rest-client:6.4.3,而这两个包都有org.elasticsearch.client.Reques这个类，导致调用出现异常

解决方案：

出现jar包冲突，通常的解决方案就是将版本不一致导致冲突的包排除，引入版本一致的依赖，具体到本次问题，将elasticsearch-rest-high-level-client的依赖包修为为：

<dependency>
    <groupId>org.elasticsearch.client</groupId>
    <artifactId>elasticsearch-rest-high-level-client</artifactId>
    <version>6.3.2</version>
    <exclusions>
        <exclusion>
            <groupId>org.elasticsearch.client</groupId>
            <artifactId>elasticsearch-rest-client</artifactId>
        </exclusion>
    </exclusions>
</dependency>

<dependency>
    <groupId>org.elasticsearch.client</groupId>
    <artifactId>elasticsearch-rest-client</artifactId>
    <version>6.3.2</version>
</dependency>