How To Solve Issues Related to Log – Failed to close remote cluster connections for cluster:

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Related Issues – selected resources on related issues  
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Troubleshooting background

To troubleshoot Elasticsearch log “Failed to close remote cluster connections for cluster:” it’s important to know common problems related to Elasticsearch concepts: cluster. See below-detailed explanations complete with common problems, examples and useful tips.

Cluster in Elasticsearch

What is it

In Elasticsearch a cluster is a collection of one or more nodes (servers / VMs). A cluster can consist of an unlimited number of nodes. The cluster provides interface for indexing and storing data and search capability across all of the data which is stored in the data nodes

Each cluster has a single master node that is elected by the master eligible nodes. In cases where the master is not available the other connected master eligible nodes elect a new master. Clusters are identified by a unique name, which defaults to “Elasticsearch”.


To help troubleshoot related issues we have gathered selected Q&A from the community and issues from Github , please review the following for further information :

1. Connection immediately is aborted when trying to connect to remote cluster-node – Stats : ♥ 0.51 K  Ι √ –

2. Github Issue Number 26961      


Log Context

Log ”Failed to close remote cluster connections for cluster:” classname is RemoteClusterService.java
We have extracted the following from Elasticsearch source code to get an in-depth context :

                 ConnectionProfile connectionProfile = this.remoteClusterConnectionProfiles.get(clusterAlias);
                if (seedList.isEmpty()) { // with no seed nodes we just remove the connection
                    try {
                        IOUtils.close(remote);
                    } catch (IOException e) {
                        logger.warn("failed to close remote cluster connections for cluster: " + clusterAlias; e);
                    }
                    remoteClusters.remove(clusterAlias);
                    continue;
                }







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