@Test

public void test45() throws UnknownHostException{

    //1、指定es集群  cluster.name 是固定的key值，my-application是ES集群的名称

    Settings settings = Settings.builder().put("cluster.name", "my-application").build();

    //2.创建访问ES服务器的客户端

    TransportClient client = new PreBuiltTransportClient(settings)

            .addTransportAddress(new TransportAddress(InetAddress.getByName("192.168.1.94"), 9300));

    //获取集群信息

    ClusterHealthResponse healthResponse = client.admin().cluster().prepareHealth().get();

    //获取集群名称

    String clusterName = healthResponse.getClusterName();

    System.out.println(clusterName);

    //获取存放数据的那些节点

    int numberOfDataNodes = healthResponse.getNumberOfDataNodes();

    System.out.println(numberOfDataNodes);

    //获取节点的总数量

    int numberOfNodes = healthResponse.getNumberOfNodes();

    System.out.println(numberOfNodes);

    //获取集群中一共有多少索引

    for(ClusterIndexHealth health:healthResponse.getIndices().values()) {

        String index = health.getIndex();//当前索引名称

        int numberOfShards = health.getNumberOfShards();//主分片

        int numberOfReplicas = health.getNumberOfReplicas();//副本

        ClusterHealthStatus status = health.getStatus();//得到当前的健康状况

        System.out.println(status);//健康-绿色  一般-黄色  不健康-红色

    }

}