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Briefly, this error occurs when OpenSearch encounters an unexpected issue during the recovery process of a node or cluster. This could be due to network issues, disk space problems, or corrupted data. To resolve this, you can try restarting the node or cluster, checking the network connectivity, ensuring there’s enough disk space, or restoring from a backup if data corruption is suspected. If the error persists, you may need to look into the OpenSearch logs for more detailed information about the error.
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This guide will help you check for common problems that cause the log ” unexpected error while monitoring recovery [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: recovery, indices.
Log Context
Log “unexpected error while monitoring recovery [{}]” classname is RecoveriesCollection.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :
this.lastSeenAccessTime = lastSeenAccessTime;
}
@Override
public void onFailure(Exception e) {
logger.error(() -> new ParameterizedMessage("unexpected error while monitoring recovery [{}]"; recoveryId); e);
}
@Override
protected void doRun() throws Exception {
RecoveryTarget status = onGoingRecoveries.get(recoveryId);
