请使用RestClient

`RestClient`通常是指Apache HttpClient库，这是一个强大的HTTP客户端库，允许你在Java应用程序中发送HTTP请求并处理响应。如果你想使用`RestClient`来替代上述`RestHighLevelClient`（Elasticsearch客户端），你可以这样操作：

import org.apache.http.HttpHost;
import org.apache.http.client.methods.CloseableHttpResponse;
import org.apache.http.client.methods.HttpGet;
import org.apache.http.impl.client.CloseableHttpClient;
import org.apache.http.impl.client.HttpClients;

@BeforeEach
public void setUp() throws Exception {
    String baseUrl = "http://192.168.150.101:9200";
    CloseableHttpClient httpClient = HttpClients.createDefault();
    HttpHost httpHost = new HttpHost(baseUrl);
    HttpGet request = new HttpGet(httpHost.toURI());
    
    // 发送GET请求，并处理响应...
    CloseableHttpResponse response = httpClient.execute(request);
    // ...在这里处理响应内容
    response.close();
    httpClient.close();
}

在这个例子中，我们首先创建一个默认的`CloseableHttpClient`实例，然后构造一个`HttpGet`请求，指向Elasticsearch的URL。通过`execute()`方法发送请求，并处理返回的`CloseableHttpResponse`。