Failed to notify index event listener – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-1.3

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Briefly, this error occurs when OpenSearch fails to notify an index event listener, which is a component that responds to changes in the index. This could be due to a network issue, a bug in the software, or a problem with the listener itself. To resolve this issue, you could try restarting the OpenSearch service, checking the network connection, or debugging the event listener to ensure it’s functioning correctly. If the problem persists, consider updating or reinstalling OpenSearch to ensure you’re using the most stable version.

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This guide will help you check for common problems that cause the log ” failed to notify index event listener ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: index, shard.

Log Context

Log “failed to notify index event listener” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

            if (wasActive) {
                logger.debug("shard is now inactive");
                try {
                } catch (Exception e) {
                    logger.warn("failed to notify index event listener"; e);


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