没有用户的传输客户端

Question

是否可以在没有xpack.security.user的情况下以弹性方式创建传输客户端。没有这个值就无法生成

import org.elasticsearch.xpack.client.PreBuiltXPackTransportClient;
...

TransportClient client = new PreBuiltXPackTransportClient(Settings.builder()
        .put("cluster.name", "myClusterName")
        .put("xpack.security.user", "transport_client_user:x-pack-test-password")
        .put("xpack.ssl.key", "/path/to/client.key")
        .put("xpack.ssl.certificate", "/path/to/client.crt")
        .put("xpack.ssl.certificate_authorities", "/path/to/ca.crt")
        .put("xpack.security.transport.ssl.enabled", "true")
        ...
        .build())
    .addTransportAddress(new TransportAddress(InetAddress.getByName("localhost"), 9300))
    .addTransportAddress(new TransportAddress(InetAddress.getByName("localhost"), 9301))