Replication target closed – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 2.7-2.8

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Briefly, this error occurs when the target node for replication in an OpenSearch cluster is closed or unavailable. This could be due to network issues, node failure, or the node being intentionally shut down. To resolve this issue, you can try restarting the closed node if it was shut down unintentionally. If it’s a network issue, check your network connections and settings. If the node has failed, you may need to replace it or redistribute its shards to other nodes in the cluster. Regular monitoring and maintenance of the cluster can help prevent such issues.

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

Log Context

Log “Replication target closed” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

                 Ignore closed replication target as it can happen due to index shard closed event in a separate thread.
                 In such scenario; ignore the exception
                assert cancellableThreads.isCancelled() : "Replication target closed but segment replication not cancelled";
      "Replication target closed"; ex);
            } catch (Exception ex) {
                ReplicationFailedException rfe = new ReplicationFailedException(
                    "failed to clean after replication";


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