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

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch fails to replicate data to other nodes in the cluster. This could be due to network issues, node failures, or insufficient resources. To resolve this, you can check the network connectivity between nodes, ensure all nodes are functioning properly, and verify that there are enough resources (CPU, memory, disk space) available. Additionally, check the cluster’s health and configuration settings. If the issue persists, consider increasing the timeout settings or reducing the load on your OpenSearch cluster.

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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 OpenSearch concepts: recovery, indices.

Log Context

Log “failed to send/replay operations” class name is We extracted the following from OpenSearch 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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