Today we don't record the start or end of a snapshot restore in the server logs by default (or even at DEBUG level). In contrast we do record regular index creation, and also the start and end of every snapshot. Snapshot restores are relatively rare, and it would definitely be helpful to see them in the logs.

I think we wouldn't want to see restores related to mounting searchable snapshots, nor creation of CCR followers, so we'd need a silent parameter rather like we have for index creation requests. I think we would usually want to see details of the restore request (e.g. the index pattern) in the log message.