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

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch encounters an issue while trying to notify the engine about a failure. This could be due to a variety of reasons such as network issues, hardware failures, or software bugs. To resolve this issue, you could try restarting the OpenSearch service, checking the network connectivity, inspecting the hardware for any failures, or updating the OpenSearch software to the latest version. Additionally, you should also check the OpenSearch logs for any additional information about the error.

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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 OpenSearch concepts: index, shard.

Log Context

Log “exception while notifying engine failure” classname is IndexShard.java.
We extracted the following from OpenSearch 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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