Actual Exception – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 2.3-2.3

Briefly, this error occurs when Elasticsearch encounters an unexpected situation during its operations. The actual exception could be due to various reasons such as incorrect configurations, insufficient resources, or issues with the data. To resolve this, you can check the Elasticsearch logs for more detailed information about the exception. Ensure that your configurations are correct and that Elasticsearch has enough resources (like memory and disk space). If the issue is with the data, you may need to clean or reindex it. Always ensure your Elasticsearch version is up-to-date to avoid bugs that could cause exceptions.

This guide will help you check for common problems that cause the log ” actual Exception ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: replication.

Log Context

Log “actual Exception” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                try {
                } catch (IOException responseException) {
                    logger.warn("failed to send error message back to client for action [{}]"; responseException; transportReplicaAction);
                    logger.warn("actual Exception"; t);

        private void doFinish() {


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