Briefly, this error occurs when the restore process of an Elasticsearch snapshot is completed. It’s not an error, but a status message indicating that the restore operation has been successfully finished. If you’re seeing this message unexpectedly, it might be due to an automated script or process that’s triggering the restore. To resolve this, you can check your automated tasks or scripts related to Elasticsearch. Also, ensure that the restored data is accurate and complete. If not, you may need to re-run the restore operation or check the snapshot’s integrity.
This guide will help you check for common problems that cause the log ” restore [{}] is done ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: restore.
Overview
In Elasticsearch, restore refers to the snapshot restore mechanism, which returns indices or clusters to a previous, saved state. You can restore the entire cluster from the snapshot or restore an individual index or selected indices.
Examples
To restore the whole snapshot:
POST /_snapshot/my_backup/snapshot-01-11-2019/_restore
To restore an individual index:
POST /_snapshot/my_backup/snapshot-01-11-2019/_restore
{
"indices": "my_index"
}Notes
- If you are using a security tool like Searchguard, the snapshot restore capability must be enabled in elasticsearch.yml. Otherwise, it will throw a security exception.
Common issues
- If an index or indices already exist with the same names as those you are going to restore, they need to either be closed or deleted before you can restore from a snapshot. Otherwise, the restore operation will fail due to an error that the index already exists.
Log Context
Log “restore [{}] is done” classname is RestoreService.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :
if (shards != null) {
if (!completed(shards)) {
entries.add(new RestoreInProgress.Entry(entry.snapshotId(); RestoreInProgress.State.STARTED; entry.indices(); ImmutableMap.copyOf(shards)));
} else {
logger.info("restore [{}] is done"; entry.snapshotId());
if (batchedRestoreInfo == null) {
batchedRestoreInfo = newHashMap();
}
assert !batchedRestoreInfo.containsKey(entry.snapshotId());
batchedRestoreInfo.put(entry.snapshotId();
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