java代码 测试elastic连接是否成功

您好，可以为您提供一些关于测试elastic连接是否成功的Java代码。请参考以下示例代码：

import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.client.RestClientBuilder;
import org.elasticsearch.client.RestClient;

public class ElasticSearchConnectionTest {

  public static void main(String[] args) {
    // 输入您的ElasticSearch主机名和端口号
    String hostname = "localhost";
    int port = 9200;

    RestClientBuilder builder = RestClient.builder(new HttpHost(hostname, port));
    RestHighLevelClient client = new RestHighLevelClient(builder);

    // 使用测试代码进行连接
    try{
        boolean pingResult = client.ping();
        System.out.println("Ping result : " + pingResult);
    } catch (Exception e) {
        System.out.println("Failed to connect to ElasticSearch : " + e.getMessage());
    } finally{
        try{
            client.close();
        } catch (Exception e) {
            System.out.println("Failed to close ElasticSearch client : " + e.getMessage());
        }
    }
  }
}

这段代码基本上是一个最简单的测试你的ElasticSearch连接的代码。它通过创建一个RestHighLevelClient来连接到ElasticSearch，并调用ping()方法来检查连接是否成功。如果代码无法连接到ElasticSearch，则会出现异常。