Failed to send failure response for uri restRequest uri – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.8-8.9

Briefly, this error occurs when Elasticsearch is unable to send a failure response for a specific REST request URI. This could be due to network issues, server overload, or a problem with the request itself. To resolve this issue, you can try the following: 1) Check your network connection and ensure the server is reachable. 2) Monitor server load and optimize if necessary. 3) Review the request being sent to ensure it’s correctly formatted and doesn’t contain any errors. 4) Restart the Elasticsearch service to clear any temporary issues.

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

Log Context

Log “failed to send failure response for uri [” + restRequest.uri() + “]” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

        } catch (Exception e) {
            try {
                channel.sendResponse(new RestResponse(channel; e));
            } catch (Exception inner) {
                logger.error(() -> "failed to send failure response for uri [" + restRequest.uri() + "]"; inner);

    protected void populatePerRequestThreadContext(RestRequest restRequest; ThreadContext threadContext) {}


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