AWS Managed Elasticsearch 上的 Java Elasticsearch 高级 REST 客户端库

Question

我在 AWS Managed Elasticsearch 上使用 Java Elasticsearch Highlevel REST Client lib，如下所示，但出现错误。

public static void main(String[] args) throws Exception {
    RestHighLevelClient client = new RestHighLevelClient(
            RestClient.builder(new HttpHost("https://search-xxxx-xxxxxxx.aws-region-x.es.amazonaws.com")));

    ClusterHealthRequest req = new ClusterHealthRequest();
    ClusterHealthResponse res =  client.cluster().health(req, RequestOptions.DEFAULT);
    System.out.println(res.toString());

    client.close();
}

错误如下:

Exception in thread "main" java.io.IOException: https://search-xxxx-xxxxxxx.aws-region-x.es.amazonaws.com
at org.elasticsearch.client.RestClient.extractAndWrapCause(RestClient.java:793)
at org.elasticsearch.client.RestClient.performRequest(RestClient.java:218)
at org.elasticsearch.client.RestClient.performRequest(RestClient.java:205)
at org.elasticsearch.client.RestHighLevelClient.internalPerformRequest(RestHighLevelClient.java:1454)
at org.elasticsearch.client.RestHighLevelClient.performRequest(RestHighLevelClient.java:1424)
at org.elasticsearch.client.RestHighLevelClient.performRequestAndParseEntity(RestHighLevelClient.java:1394)
at org.elasticsearch.client.ClusterClient.health(ClusterClient.java:118)
at ClusterHealthCheck.main(ClusterHealthCheck.java:15)
Caused by: java.net.UnknownHostException: https://search-xxxx-xxxxxxx.aws-region-x.es.amazonaws.com
at java.net.Inet6AddressImpl.lookupAllHostAddr(Native Method)
at java.net.InetAddress$2.lookupAllHostAddr(InetAddress.java:928)
at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1323)
at java.net.InetAddress.getAllByName0(InetAddress.java:1276)
at java.net.InetAddress.getAllByName(InetAddress.java:1192)
at java.net.InetAddress.getAllByName(InetAddress.java:1126)
at org.apache.http.impl.conn.SystemDefaultDnsResolver.resolve(SystemDefaultDnsResolver.java:45)
at org.apache.http.impl.nio.conn.PoolingNHttpClientConnectionManager$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:214)

我将此代码用于本地 Elasticsearch，一切正常。会发生什么？

Answer 1

我也遇到了同样的异常。我通过稍微更改主机并向 HttpHost 对象添加其他参数来解决这个问题。它看起来与 Seetha 的答案相似，但这对我不起作用。您可以尝试以下操作:

public static void main(String[] args) throws Exception {
    RestHighLevelClient client = new RestHighLevelClient(
            RestClient.builder(new HttpHost("search-xxxx-xxxxxxx.aws-region-x.es.amazonaws.com", 443, "https")));

    ClusterHealthRequest req = new ClusterHealthRequest();
    ClusterHealthResponse res =  client.cluster().health(req, RequestOptions.DEFAULT);
    System.out.println(res.toString());

    client.close();
}