If an aggregation targets a view, we first acquire the view, then relinquish the locks and re-acquire them over collection the view is on.

For viewful timeseries collections ('tscoll' view on 'system.buckets.tscoll' collection), it's possible that the aggregation sees the 'tscoll' view, then it releases the locks and concurrently an upgrade to viewless timeseries happens. When we then re-acquire 'system.buckets.tscoll', we don't find it because it has been converted by the upgrade.

If this happens and we continue, we return incorrect (empty) results. We should instead re-resolve the aggregation.