Failed to send failure – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-8.8

Briefly, this error occurs when Elasticsearch is unable to send a failure response due to network issues, node failures, or resource constraints. To resolve this issue, you can try the following: 1) Check the network connectivity between the nodes. 2) Verify the health status of the nodes in the cluster. 3) Check if there are any resource constraints like disk space, CPU, or memory. 4) Review the Elasticsearch logs for more detailed error messages. 5) If the issue persists, consider increasing the timeout settings or scaling up your resources.

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

Log Context

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

            nodeOperation(task; request; ActionListener.wrap(channel::sendResponse; e -> {
                try {
                } catch (IOException e1) {
                    logger.warn("Failed to send failure"; e1);


How helpful was this guide?

We are sorry that this post was not useful for you!

Let us improve this post!

Tell us how we can improve this post?