ES报错：org.elasticsearch.transport.TcpTransport.sendMessage(Ljava/lang/Object;Lorg/elasticsearch/co...

原因是：maven的jar包管理问题

解决方法：

<dependency>

    <groupId>org.elasticsearch</groupId>

    <artifactId>elasticsearch</artifactId>

    <version>xxx</version>

</dependency>

<dependency>

    <groupId>org.elasticsearch.client</groupId>

    <artifactId>transport</artifactId>

    <version>xxx</version>

    <exclusions>

        <exclusion>

        <groupId>org.elasticsearch.plugin</groupId>

        <artifactId>transport-netty4-client</artifactId>

        </exclusion>

    </exclusions>

</dependency>

<dependency>

    <groupId>org.elasticsearch.plugin</groupId>

    <artifactId>transport-netty4-client</artifactId>

    <version>xxx</version>

</dependency>