Unexpected error while trying to finalize cluster join – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 2.3-2.3

Briefly, this error occurs when a node in Elasticsearch fails to join a cluster due to network issues, incorrect configuration, or version incompatibility. To resolve this, ensure all nodes are running the same Elasticsearch version. Check your network connectivity and firewall settings to ensure nodes can communicate. Also, verify your cluster settings in the elasticsearch.yml file, particularly the ‘cluster.name’ and ‘discovery.seed_hosts’ parameters. If the issue persists, consider increasing the ‘discovery.zen.join_timeout’ value to allow more time for nodes to join the cluster.

This guide will help you check for common problems that cause the log ” unexpected error while trying to finalize cluster join ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: cluster, discovery and join.

Log Context

Log “unexpected error while trying to finalize cluster join” classname is ZenDiscovery.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                     return currentState;

                public void onFailure(String source; 
Nullable Throwable t) {
                    logger.error("unexpected error while trying to finalize cluster join"; t);


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