Failed to notify listeners – How to solve related issues

Opster Team

Jan-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you run Elasticsearch Error Check-Up which can resolve issues that cause many errors.

This guide will help you check for common problems that cause the log ” Failed to notify listeners ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: listeners and snapshots.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up to analyze Elasticsearch configuration and help resolve this error.

Log Context

Log “Failed to notify listeners” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                             ActionListener.onFailure(completionListeners; failure);
                        } else {
                            ActionListener.onResponse(completionListeners; snapshotInfo);
                    } catch (Exception e) {
                        logger.warn("Failed to notify listeners"; e);
                if (listener != null) {


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