We retry an aggregation if we're initially running on a view, and the resolved collection concurrently becomes a view (e.g. if another thread drops and recreates the nss as a view). However, the error name is ambiguous and notably should not be used if an aggregation is running on a collection that concurrently becomes a view (we normally throw CommandNotSupportedOnView in this case). This should be renamed for clarity and to avoid misuse.