Unexpected error while monitoring recovery – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-8.2

Briefly, this error occurs when Elasticsearch encounters an unexpected issue during the recovery process of a node or shard. This could be due to network issues, disk space problems, or corrupted data. To resolve this, you can try the following: 1) Check the network connectivity between nodes; 2) Ensure there is enough disk space available; 3) Check the Elasticsearch logs for more detailed error information; 4) If data corruption is suspected, consider restoring from a backup.

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 Elasticsearch concepts: indices, recovery.

Log Context

Log “unexpected error while monitoring recovery [{}]” classname is RecoveriesCollection.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

            this.lastSeenAccessTime = lastSeenAccessTime;

        public void onFailure(Exception e) {
            logger.error(() -> new ParameterizedMessage("unexpected error while monitoring recovery [{}]"; recoveryId); e);

        protected void doRun() throws Exception {
            RecoveryTarget status = onGoingRecoveries.get(recoveryId);


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