Error while communicating with remote cluster clusterAlias – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7-8.9

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Briefly, this error occurs when Elasticsearch is unable to establish a connection with a remote cluster, identified by the ‘clusterAlias’. This could be due to network issues, incorrect cluster settings, or the remote cluster being down. To resolve this, ensure the remote cluster is up and running, check the network connectivity between the clusters, and verify the cluster settings, particularly the ‘clusterAlias’. Also, check the Elasticsearch logs for more detailed error information.

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This guide will help you check for common problems that cause the log ” error while communicating with remote cluster [” + clusterAlias + “] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: alias, search, cluster.

Log Context

Log “error while communicating with remote cluster [” + clusterAlias + “]” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 abstract FinalResponse createFinalResponse();
 }  private static RemoteTransportException wrapRemoteClusterFailure(String clusterAlias; Exception e) {
 return new RemoteTransportException("error while communicating with remote cluster [" + clusterAlias + "]"; e);
 }  static Map getIndicesFromSearchContexts(SearchContextId searchContext; IndicesOptions indicesOptions) {
 final Map> indices = new HashMap<>();
 for (Map.Entry entry : searchContext.shards().entrySet()) {


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