Failed to send replay operations – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.9-8.9

Briefly, this error occurs when Elasticsearch is unable to send or replay operations due to network issues, node failures, or configuration problems. To resolve this, you can check the network connectivity between nodes, ensure that the nodes are running properly, and verify the cluster settings. Additionally, check the Elasticsearch logs for more detailed error messages that can help identify the root cause. If the issue is related to heavy indexing, consider adjusting the index settings or scaling up your cluster.

This guide will help you check for common problems that cause the log ” failed to send/replay operations ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: recovery, indices.

Log Context

Log “failed to send/replay operations” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 }  @Override
 protected void handleError(Translog.Snapshot snapshot; Exception e) {
 throw new RecoveryEngineException(shard.shardId(); 2; "failed to send/replay operations"; e);
 }  @Override
 public void close() throws IOException {


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