Failed to close shard – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-8.9

Briefly, this error occurs when Elasticsearch encounters an issue while trying to close a shard, which could be due to a network disruption, disk space issue, or a problem with the underlying hardware. To resolve this issue, you can try the following: 1) Check the cluster health and ensure all nodes are connected. 2) Verify there’s enough disk space available. 3) Check the hardware for any potential issues. 4) If the problem persists, consider relocating the shard to another node.

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

Log Context

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

                final Set shardIds = shardIds();
                for (final int shardId : shardIds) {
                    try {
                        removeShard(shardId; reason);
                    } catch (Exception e) {
                        logger.warn("failed to close shard"; e);
            } finally {


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