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	`1`	`+## Client`
	`2`	`+`
	`3`	`+Java 客户端连接 Elasticsearch`
	`4`	`+`
	`5`	+一个是`TransportClient`,一个是`NodeClient`,还有一个`XPackTransportClient`
	`6`	`+`
	`7`	`+- TransportClient:`
	`8`	`+作为一个外部访问者,请求ES的集群,对于集群而言,它是一个外部因素。`
	`9`	`+`
	`10`	`+`
	`11`	`+- NodeClient`
	`12`	`+`
	`13`	`+作为ES集群的一个节点,它是ES中的一环,其他的节点对它是感知的。`
	`14`	`+`
	`15`	`+- XPackTransportClient:`
	`16`	`+`
	`17`	+服务安装了 `x-pack` 插件

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