java RestHighLevelClient 连接开启SSL的ES

要使用Java RestHighLevelClient连接开启SSL的Elasticsearch，您需要进行以下步骤：

1.将Elasticsearch的证书添加到Java的信任库中。您可以使用keytool命令将证书导入到Java的信任库中：

keytool -importcert -file path/to/cert.crt -alias esCert -keystore path/to/truststore.jks

2.创建RestHighLevelClient时，指定SSL上下文。您可以使用以下代码示例：

KeyStore truststore = KeyStore.getInstance("jks");
truststore.load(new FileInputStream(new File("path/to/truststore.jks")), "password".toCharArray());

SSLContextBuilder sslBuilder = SSLContexts.custom().loadTrustMaterial(truststore, null);
final SSLContext sslContext = sslBuilder.build();
RestClientBuilder builder = RestClient.builder(new HttpHost("localhost", 9200, "https"))
        .setHttpClientConfigCallback(new HttpClientConfigCallback() {
            @Override
            public HttpAsyncClientBuilder customizeHttpClient(HttpAsyncClientBuilder httpClientBuilder) {
                return httpClientBuilder.setSSLContext(sslContext);
            }
        });
RestHighLevelClient client = new RestHighLevelClient(builder);

以上代码假定您的Elasticsearch运行在本地机器上，端口号为9200，并且证书已经添加到了Java的信任库中。

希望这可以帮助您连接到开启SSL的Elasticsearch。