Unexpected error during – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-7.17

Briefly, this error occurs when Elasticsearch encounters an unexpected issue during a process, such as indexing or searching. This could be due to various reasons like insufficient memory, incorrect configurations, or network issues. To resolve this, you can increase the memory allocation, check and correct the configurations, or troubleshoot the network. Additionally, checking the Elasticsearch logs can provide more specific details about the error, which can help in identifying the exact issue and resolving it.

This guide will help you check for common problems that cause the log ” unexpected error during [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: discovery.

Log Context

Log “unexpected error during [{}]” classname is NodeJoinController.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

        public void clusterStateProcessed(String source; ClusterState oldState; ClusterState newState) {
            for (MembershipAction.JoinCallback callback : callbacks) {
                try {
                } catch (Exception e) {
                    logger.error(() -> new ParameterizedMessage("unexpected error during [{}]"; source); e);


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