ElasticSearch 可以通过info()方法检索群集信息：

public void info(){
       RestHighLevelClient client = elasticClient.getRestHighLevelClient();
       MainResponse response = null;
       try {
           response = client.info(RequestOptions.DEFAULT);
       } catch (IOException e) {
           e.printStackTrace();
       }
       //返回集群的各种信息
       ClusterName clusterName = response.getClusterName(); //集群名称
       String clusterUuid = response.getClusterUuid(); //群集的唯一标识符
       String nodeName = response.getNodeName(); //已执行请求的节点的名称
       Version version = response.getVersion(); //已执行请求的节点的版本
       Build build = response.getBuild(); //已执行请求的节点的构建信息
   }