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

Opster Team

August-23, Version: 6.8-6.8

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Briefly, this error occurs when Elasticsearch is unable to establish a connection with a remote cluster, identified by the variable “clusterName”. This could be due to network issues, incorrect cluster settings, or the remote cluster being down. To resolve this, you can check the network connectivity, verify the cluster settings, ensure the remote cluster is up and running, or 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 [” + clusterName + “] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: cluster.

Log Context

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

 }  @Override
 public void onFailure(Exception e) {
 RemoteTransportException exception =
 new RemoteTransportException("error while communicating with remote cluster [" + clusterName + "]"; e);
 if (transportException.compareAndSet(null; exception) == false) {
 exception = transportException.accumulateAndGet(exception; (previous; current) -> {
 return current;


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