Failed to send response while failing shard – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 5-5

Briefly, this error occurs when Elasticsearch is unable to send a response due to a shard failure. This could be due to issues like network problems, disk space issues, or corrupted indices. To resolve this, you can try the following: 1) Check your network connectivity and ensure that all nodes are reachable. 2) Verify that there is sufficient disk space available. 3) Use the Elasticsearch Check Index API to identify and fix any corrupted indices. 4) If the issue persists, consider increasing the timeout value or scaling your cluster to handle more load.

This guide will help you check for common problems that cause the log ” {} failed to send response while failing shard [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: cluster, response and shard.

Log Context

Log “{} failed to send response while failing shard [{}]” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                    public void clusterStateProcessed(String source; ClusterState oldState; ClusterState newState) {
                        try {
                        } catch (Exception channelException) {
                            logger.warn((Supplier>) () -> new ParameterizedMessage("{} failed to send response while failing shard [{}]"; request.shardId; request); channelException);


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