Deletes a specific reflection and all associated information. This removes the materialization associated with the reflection asynchronously, after a brief delay. This wait is so that ongoing queries, if any, complete as planned.
If a query is in progress when a reflection is deleted, it will still complete as planned.
403 - user does not have permission to delete the reflection (has to be an administrator).
404 - a reflection with the specified id could not be found.