Failed to send response – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-8.6

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Briefly, this error occurs when Elasticsearch is unable to send a response due to network issues, overloaded server, or a problem with the client receiving the response. To resolve this, you can check the network connection between the client and the server. If the server is overloaded, consider optimizing your queries or scaling your Elasticsearch cluster. If the client is the issue, ensure it’s properly configured to receive responses.

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

Log Context

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

                } catch (TaskCancelledException e) {
                    try {
                    } catch (IOException ioException) {
                        logger.warn("failed to send response"; e);
            List accumulatedExceptions = new ArrayList();


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