如何配置RestHighLevelClient连接远程Elasticsearch主机？

• 你的代码问题出在HttpHost的参数使用错误：HttpHost构造时第一个参数只需传纯主机地址（不要带http://前缀），协议、主机、端口需要分开指定。

• 正确的基础配置代码：

RestHighLevelClient client = new RestHighLevelClient(
        RestClient.builder(
                new HttpHost("example.com", 9200, "http") // 替换为你的远程主机地址、端口、协议
        )
);

• 适配HTTPS或自定义端口的场景：

// 示例：连接HTTPS协议、端口9243的远程主机
RestHighLevelClient client = new RestHighLevelClient(
        RestClient.builder(
                new HttpHost("your-remote-es-host.com", 9243, "https")
        )
);

• 若远程Elasticsearch需身份验证，可添加请求拦截器：

CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
credentialsProvider.setCredentials(AuthScope.ANY,
        new UsernamePasswordCredentials("your-username", "your-password"));

RestHighLevelClient client = new RestHighLevelClient(
        RestClient.builder(
                new HttpHost("example.com", 9200, "http")
        ).setHttpClientConfigCallback(httpClientBuilder ->
                httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider)
        )
);

内容的提问来源于stack exchange，提问作者Madhu Reddy