Failing shard failedShardEntry – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.3-8.9

Briefly, this error occurs when a shard in Elasticsearch fails to operate as expected. This could be due to a variety of reasons such as hardware failure, network issues, or data corruption. To resolve this issue, you can try the following: 1) Check the node logs for more detailed error messages. 2) If it’s a hardware or network issue, fix the underlying problem. 3) If it’s a data corruption issue, you may need to restore the shard from a backup. 4) If the shard is not recoverable, you may need to delete and recreate it.

This guide will help you check for common problems that cause the log ” failing shard [” + failedShardEntry + “] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: routing, allocation, cluster, shard.

Log Context

Log “failing shard [” + failedShardEntry + “]” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                if (failedShardEntry.markAsStale()) {
                logger.warn(() -> "failing shard [" + failedShardEntry + "]"; failedShardEntry.failure());
                allocation.routingNodes().failShard(logger; failedShard; unassignedInfo; allocation.changes());
            } else {
                logger.trace("{} shard routing failed in an earlier iteration (routing: {})"; shardToFail.shardId(); shardToFail);


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