Failed to close remote cluster connections for cluster – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch is unable to close connections to a remote cluster. This could be due to network issues, incorrect configuration, or the remote cluster being unavailable. To resolve this issue, you can check the network connectivity between the clusters, verify the remote cluster settings, or ensure the remote cluster is up and running. If the problem persists, consider restarting the Elasticsearch service or the entire cluster.

This guide will help you check for common problems that cause the log ” failed to close remote cluster connections for cluster: ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: cluster.

Log Context

Log “failed to close remote cluster connections for cluster: ” classname is RemoteClusterService.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

        RemoteClusterConnection remote = this.remoteClusters.get(clusterAlias);
        if (RemoteConnectionStrategy.isConnectionEnabled(clusterAlias; newSettings) == false) {
            try {
                IOUtils.close(remote);
            } catch (IOException e) {
                logger.warn("failed to close remote cluster connections for cluster: " + clusterAlias; e);
            }
            remoteClusters.remove(clusterAlias);
            listener.onResponse(null);
            return;
        }

 

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