Failed send response for shard active while trying to – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-7.15

Briefly, this error occurs when Elasticsearch is unable to send a response due to an active shard. This could be due to network issues, high load on the cluster, or a problem with the shard itself. To resolve this, you can try to reduce the load on the cluster, check the network connectivity, or investigate the health of the shard. If the shard is corrupted, you may need to restore it from a backup. Additionally, ensure that your Elasticsearch version is up-to-date as this could also be a bug that has been fixed in a newer version.

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

Log Context

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

                        public void sendResult(boolean shardActive) {
                            try {
                                channel.sendResponse(new ShardActiveResponse(shardActive; clusterService.localNode()));
                            } catch (IOException | EsRejectedExecutionException e) {
                                logger.error(() -> new ParameterizedMessage("failed send response for shard active while trying to " +
                                    "delete shard {} - shard will probably not be removed"; request.shardId); e);
                    }; newState -> {
                        // the shard is not there in which case we want to send back a false (shard is not active);


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