java elasticsearch 5.4.0 x-pack client

以下都是从摘自elasticsearch官网，只不过提出几点需要大家注意的

1.java x-pack认证依赖的jar包是

<dependencies>      <!-- add the x-pack jar as a dependency -->      <dependency>         <groupId>org.elasticsearch.client</groupId>         <artifactId>x-pack-transport</artifactId>         <version>5.4.0</version>      </dependency>   </dependencies>

这个包依赖的是elasticsearch自己搭建的一个仓库，往往我们会漏掉，如下是完整的maven依赖内容：

<repositories>      <!-- add the elasticsearch repo -->      <repository>         <id>elasticsearch-releases</id>         <url>https://artifacts.elastic.co/maven</url>         <releases>            <enabled>true</enabled>         </releases>         <snapshots>            <enabled>false</enabled>         </snapshots>      </repository>   </repositories>   <dependencies>      <!-- add the x-pack jar as a dependency -->      <dependency>         <groupId>org.elasticsearch.client</groupId>         <artifactId>x-pack-transport</artifactId>         <version>5.4.0</version>      </dependency>   </dependencies>

2.java.lang.IllegalArgumentException: unknown setting [xpack.security.user] please check that any required plugins are installed, or check the breaking changes documentation for removed settings；初始化elasticsearch客户端报以上错，所以还是得细心地，依赖的是刚才第一点引入的jar包中文件：org.elasticsearch.xpack.client.PreBuiltXPackTransportClient，记住是这个包，不然你默认引用进来的包会有问题。另外TransportClient文件是引用的elasticsearch-5.4.0.jar包的。