Failed to send error back to recovery source – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 2.3-2.3

Briefly, this error occurs when Elasticsearch encounters an issue while trying to send an error message back to the recovery source during the recovery process of a shard. This could be due to network issues, node failures, or a problem with the recovery source itself. To resolve this issue, you can try restarting the Elasticsearch node, checking the network connectivity, or investigating the health and status of the recovery source. If the problem persists, you may need to consider reindexing your data.

This guide will help you check for common problems that cause the log ” failed to send error back to recovery source ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: indices, recovery and source.

Log Context

Log “failed to send error back to recovery source” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

protected void onFailure(Exception e) {
                            try {
                            } catch (IOException e1) {
                                logger.warn("failed to send error back to recovery source"; e1);

                        public void onClusterServiceClose() {


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