Finished upgrading snapshot – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 7.11-8.9

Briefly, this error occurs when Elasticsearch has completed the process of upgrading a snapshot. This is not an error message but an informational message indicating that the snapshot upgrade process has been successfully completed. If you’re seeing this message frequently and it’s causing confusion, you may want to adjust your logging settings to reduce the verbosity. Alternatively, if you didn’t initiate a snapshot upgrade, it’s worth checking your Elasticsearch configuration and scripts to ensure there are no unintended operations being performed.

This guide will help you check for common problems that cause the log ” [{}] [{}] finished upgrading snapshot ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin, snapshot.

Log Context

Log “[{}] [{}] finished upgrading snapshot” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

        ActionListener stateAliasHandler = ActionListener.wrap(
            r -> autodetectProcessManager.upgradeSnapshot((SnapshotUpgradeTask) task; e -> {
                if (e == null) {
          ; "Finished upgrading snapshot [" + snapshotId + "]");
          "[{}] [{}] finished upgrading snapshot"; jobId; snapshotId);
                } else {
                    logger.warn(() -> format("[%s] failed upgrading snapshot [%s]"; jobId; snapshotId); e);