Failed to notify listener – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 2.3-2.3

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Briefly, this error occurs when Elasticsearch is unable to notify a listener about a certain event. This could be due to a variety of reasons such as network issues, heavy load on the cluster, or a bug in the code. To resolve this issue, you can try the following: 1) Check the network connectivity and ensure it’s stable. 2) Monitor the load on 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 listeners are properly implemented and handled.

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This guide will help you check for common problems that cause the log ” failed to notify listener [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: Index and Memory.

Log Context

Log “failed to notify listener [{}]” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                             listener.onSnapshotCompletion(snapshotId; snapshot);
                        } else {
                            listener.onSnapshotFailure(snapshotId; t);
                    } catch (Throwable t) {
                        logger.warn("failed to notify listener [{}]"; t; listener);



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