Failing snapshot of shard on unassigned shard – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch attempts to create a snapshot of a shard that is currently unassigned. This could be due to a node failure, network issues, or disk space problems. To resolve this issue, you can try to manually reassign the shard if it’s due to a temporary problem. If it’s a persistent issue, consider checking the health of your nodes, ensuring there’s enough disk space, and verifying network connectivity. If the problem persists, you may need to recreate the index or restore it from a previous snapshot.

This guide will help you check for common problems that cause the log ” failing snapshot of shard [{}] on unassigned shard [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: snapshot, shard.

Log Context

Log “failing snapshot of shard [{}] on unassigned shard [{}]” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                // Shard that we were waiting for went into unassigned state or disappeared - giving up
                snapshotChanged = true;
                logger.warn("failing snapshot of shard [{}] on unassigned shard [{}]"; shardId; shardStatus.nodeId());
                final ShardSnapshotStatus failedState = new ShardSnapshotStatus(
                    "shard is unassigned";


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