RestHighLevelClient怎么连接有密码的Es

要连接有密码的 Elasticsearch，你可以使用 `RestHighLevelClient` 的 `Builder` 类来设置连接参数。首先，你需要创建一个 `CredentialsProvider` 对象，用于提供连接凭证。然后，将该凭证提供者设置到 `Builder` 中，最后通过 `build()` 方法创建 `RestHighLevelClient` 的实例。

以下是一个示例代码：

import org.apache.http.HttpHost;
import org.apache.http.auth.AuthScope;
import org.apache.http.auth.UsernamePasswordCredentials;
import org.apache.http.impl.client.BasicCredentialsProvider;
import org.elasticsearch.client.RestClient;
import org.elasticsearch.client.RestClientBuilder;
import org.elasticsearch.client.RestHighLevelClient;

public class Main {
    public static void main(String[] args) {
        String hostname = "localhost"; // Elasticsearch 服务器主机名
        int port = 9200; // Elasticsearch 服务器端口号
        String username = "your-username"; // Elasticsearch 用户名
        String password = "your-password"; // Elasticsearch 密码

        // 创建凭证提供者并设置用户名和密码
        final BasicCredentialsProvider credentialsProvider = new BasicCredentialsProvider();
        credentialsProvider.setCredentials(AuthScope.ANY, new UsernamePasswordCredentials(username, password));

        // 创建 RestClient 构建器
        RestClientBuilder builder = RestClient.builder(new HttpHost(hostname, port, "http"))
                .setHttpClientConfigCallback(httpClientBuilder -> httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider));

        // 创建 RestHighLevelClient 实例
        RestHighLevelClient client = new RestHighLevelClient(builder);
        
        // 使用 client 进行操作...
        
        // 关闭客户端连接
        try {
            client.close();
        } catch (Exception e) {
            e.printStackTrace();
        }
    }
}