Failed to close shard – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch encounters an issue while trying to close a shard, which could be due to a network problem, disk issue, or a bug in the system. To resolve this, you can try the following: 1) Check the network connectivity between the nodes. 2) Inspect the disk space and health on the node where the shard resides. 3) Look for any bugs or issues in the OpenSearch logs that might be causing this error. 4) Restart the OpenSearch node. Always ensure you have a backup before performing any operation.

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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 OpenSearch concepts: index, shard.

Log Context

Log “failed to close shard” classname is
We extracted the following from OpenSearch 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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