无法将我的 java 应用程序连接到 Elastic Stack 实例

Question

我已经通过 Google Cloud 设置了我的 Elastic Cloud Service 并设置了一个 Elastic Search 实例。

我可以将我的数据上传到 Elastic 搜索并查询我的数据。但是，当我尝试通过 Java 客户端连接到 Elastic Search 实例时，我不断收到 'java.io.IOException' 和 'java.net.UnknownHostException' 异常。

24-Jun-2020 18:55:52.657 SEVERE [http-nio-8181-exec-8] org.apache.catalina.core.StandardWrapperValve.invoke Servlet.service() for servlet [dispatcher] in context with path [] threw exception
     java.io.IOException: <Elastic Search endpoint>
        at org.elasticsearch.client.RestClient.extractAndWrapCause(RestClient.java:828)
        at org.elasticsearch.client.RestClient.performRequest(RestClient.java:248)
        at org.elasticsearch.client.RestClient.performRequest(RestClient.java:235)
        at org.elasticsearch.client.RestHighLevelClient.internalPerformRequest(RestHighLevelClient.java:1611)
        
    Caused by: java.net.UnknownHostException: <Elastic Search Endpoint>
        at java.base/java.net.InetAddress$CachedAddresses.get(InetAddress.java:797)
        at java.base/java.net.InetAddress.getAllByName0(InetAddress.java:1505)
        at java.base/java.net.InetAddress.getAllByName(InetAddress.java:1364)
        at java.base/java.net.InetAddress.getAllByName(InetAddress.java:1298)
        at org.apache.http.impl.conn.SystemDefaultDnsResolver.resolve(SystemDefaultDnsResolver.java:45)
        at org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager$InternalAddressResolver.resolveRemoteAddress(PoolingNHttpClientConnectionManager.java:664)
        at org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager$InternalAddressResolver.resolveRemoteAddress(PoolingNHttpClientConnectionManager.java:635)
        at org.apache.http.nio.pool.AbstractNIOConnPool.processPendingRequest(AbstractNIOConnPool.java:474)
        at org.apache.http.nio.pool.AbstractNIOConnPool.lease(AbstractNIOConnPool.java:280)
        at org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager.requestConnection(PoolingNHttpClientConnectionManager.java:295)
        at org.apache.http.impl.nio.client.AbstractClientExchangeHandler.requestConnection(AbstractClientExchangeHandler.java:377)
        at org.apache.http.impl.nio.client.DefaultClientExchangeHandlerImpl.start(DefaultClientExchangeHandlerImpl.java:129)
        at org.apache.http.impl.nio.client.InternalHttpAsyncClient.execute(InternalHttpAsyncClient.java:141)
        at org.elasticsearch.client.RestClient.performRequest(RestClient.java:244)
        ... 49 more

还有我的Java代码：

String ELASTIC_SEARCH_USER_NAME = "elastic";
String ELASTIC_SEARCH_PASSWORD = <Password>;
String ELASTIC_SEARCH_ENDPOINT_URL = "https://92d5f385db294fb4b7ff335201d0a854.asia-northeast1.gcp.cloud.es.io";
Integer ELASTIC_SEARCH_PORT = 9243;

final CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
credentialsProvider.setCredentials(AuthScope.ANY, new UsernamePasswordCredentials(ELASTIC_SEARCH_USER_NAME, ELASTIC_SEARCH_PASSWORD));

RestClientBuilder builder = RestClient.builder(new HttpHost(ELASTIC_SEARCH_ENDPOINT_URL, ELASTIC_SEARCH_PORT, "https"))
                    .setHttpClientConfigCallback(new RestClientBuilder.HttpClientConfigCallback() {
                        @Override
                        public HttpAsyncClientBuilder customizeHttpClient(HttpAsyncClientBuilder httpClientBuilder) {
                            return httpClientBuilder.setDefaultCredentialsProvider(credentialsProvider);
                        }
                    });

RestHighLevelClient highLevelClient = new RestHighLevelClient(builder);

奇怪的是，我尝试在命令行中 ping 我的端点 url，但我的 cmd 无法 ping url。

我的 Java 客户端需要在我的 Elastic Stack 控制台中设置什么来请求查询吗？

谢谢！

Answer 1

您确定您的 Elasticsearch 在端口 9243 上运行吗？这是在 GCP 中，但对于 AWS 托管的 ES，无需提供 port 编号，仅 url 就足够了，更改以下部分代码并查看它是否可以正常工作AWS ES 端口就不用说了。

RestClientBuilder builder = RestClient.builder(new HttpHost(ELASTIC_SEARCH_ENDPOINT_URL,, "https"))

Answer 2

在 elastic.co 论坛上询问这些人，他们建议我从 ELASTIC_SEARCH_ENDPOINT_URL.

中删除“https://”部分

String ELASTIC_SEARCH_ENDPOINT_URL = "https://92d5f385db294fb4b7ff335201d0a854.asia-northeast1.gcp.cloud.es.io";

到

String ELASTIC_SEARCH_ENDPOINT_URL = "92d5f385db294fb4b7ff335201d0a854.asia-northeast1.gcp.cloud.es.io";

并保留其余代码，它成功了！

The forum post I made if anyone wants to take a look

无法将我的 java 应用程序连接到 Elastic Stack 实例

Unable to connect my java application to the Elastic Stack Instance

java

elasticsearch

elastic-stack

elasticsearch-5