Shard is already closed closing replication – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 2.9-2.9

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Briefly, this error occurs when an attempt is made to replicate data to a shard that has already been closed in OpenSearch. This could be due to a network issue, a node failure, or a manual intervention. To resolve this issue, you can try the following: 1) Restart the OpenSearch node, this might help in re-establishing the connection. 2) Check the cluster health and ensure all nodes are functioning properly. 3) If the error persists, you may need to re-index the data. Always ensure to have a backup of your data to prevent any loss.

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This guide will help you check for common problems that cause the log ” Shard is already closed; closing replication ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: indices, replication, shard.

Log Context

Log “Shard is already closed; closing replication” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

            throw new OpenSearchCorruptionException(ex);
        } catch (AlreadyClosedException ex) {
            // In this case the shard is closed at some point while updating the reader.
            // This can happen when the engine is closed in a separate thread.
            logger.warn("Shard is already closed; closing replication");
        } catch (OpenSearchException ex) {
             Ignore closed replication target as it can happen due to index shard closed event in a separate thread.
             In such scenario; ignore the exception


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