Exception while notifying engine failure – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch encounters an issue while trying to notify about a failure in the engine. This could be due to a variety of reasons such as disk space issues, network connectivity problems, or a bug in the Elasticsearch software. To resolve this issue, you can try freeing up disk space, checking your network connections, or updating Elasticsearch to the latest version. If the problem persists, you may need to check the Elasticsearch logs for more detailed information about the error.

This guide will help you check for common problems that cause the log ” exception while notifying engine failure ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index, shard.

Log Context

Log “exception while notifying engine failure” classname is IndexShard.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

            for (Consumer listener : delegates) {
                try {
                } catch (Exception inner) {
                    logger.warn("exception while notifying engine failure"; inner);


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