'SecurityClient(org.elasticsearch.client.RestHighLevelClient)' is not public in 'org.elasticsearch.client.SecurityClient

这个错误是因为 `SecurityClient` 的构造函数不是公共的，不能从包外访问。解决这个问题的方法是使用 `XPackClient` 来创建 `SecurityClient`。 以下是修改后的代码示例： ```java import org.apache.http.HttpHost; import org.elasticsearch.action.ActionListener; import org.elasticsearch.action.admin.cluster.health.ClusterHealthRequest; import org.elasticsearch.action.admin.cluster.health.ClusterHealthResponse; import org.elasticsearch.action.index.IndexRequest; import org.elasticsearch.action.index.IndexResponse; import org.elasticsearch.client.RestClient; import org.elasticsearch.client.RestHighLevelClient; import org.elasticsearch.common.settings.Settings; import org.elasticsearch.common.transport.TransportAddress; import org.elasticsearch.common.unit.TimeValue; import org.elasticsearch.common.xcontent.XContentType; import org.elasticsearch.plugins.Plugin; import org.elasticsearch.transport.client.PreBuiltTransportClient; import org.elasticsearch.xpack.client.PreBuiltXPackTransportClient; import org.elasticsearch.xpack.security.authc.support.UsernamePasswordToken; import org.elasticsearch.xpack.security.client.SecurityClient; import org.elasticsearch.xpack.client.PreBuiltXPackTransportClient; import java.net.InetAddress; import java.util.Collections; public class CreateUserExample { public static void main(String[] args) throws Exception { // 创建 RestHighLevelClient RestHighLevelClient client = new RestHighLevelClient( RestClient.builder(new HttpHost("localhost", 9200, "http"))); // 创建用户名和密码 String username = "testuser"; String password = "testpassword"; // 创建用户请求 SecurityClient securityClient = new PreBuiltXPackTransportClient(Settings.EMPTY) .addTransportAddress(new TransportAddress(InetAddress.getByName("localhost"), 9300)) .authenticate(new UsernamePasswordToken(username, password)) .security(); ActionListener listener = new ActionListener() { @Override public void onResponse(Void response) { System.out.println("User created successfully."); } @Override public void onFailure(Exception e) { System.out.println("Failed to create user: " + e.getMessage()); } }; securityClient.createUser(username, password.toCharArray(), Collections.singletonList("user"), listener); // 关闭客户端 client.close(); } } ``` 在上面的示例代码中，我们使用 `PreBuiltXPackTransportClient` 创建了一个新的 `SecurityClient`。然后