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

Opster Team

Aug-23, Version: 6.8-7.17

Briefly, this error occurs when Elasticsearch encounters an issue while trying to notify an index event listener. This could be due to a variety of reasons such as network issues, resource constraints, or a bug in the code. To resolve this issue, you can try the following: 1) Check the network connectivity and ensure that there are no interruptions. 2) Monitor the resource usage of your Elasticsearch cluster and scale it up if necessary. 3) Update Elasticsearch to the latest version to fix any potential bugs. 4) Review your code to ensure that the event listener is implemented correctly.

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 Elasticsearch concepts: index, shard.

Log Context

Log “failed to notify index event listener” classname is
We extracted the following from Elasticsearch 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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