Failed to send failure response – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch is unable to send a failure response due to network issues, node failures, or a problem with the cluster’s health. To resolve this issue, you can try the following: 1) Check the network connectivity between the nodes. 2) Verify the health of the cluster and ensure all nodes are functioning properly. 3) Check the Elasticsearch logs for more detailed error messages that can help identify the root cause. 4) If the issue persists, consider restarting the Elasticsearch service.

This guide will help you check for common problems that cause the log ” failed to send failure response ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: rest, response.

Log Context

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

    public final void onFailure(Exception e) {
        try {
            channel.sendResponse(new RestResponse(channel; e));
        } catch (Exception inner) {
            logger.error("failed to send failure response"; inner);