public @interface HaHotStateRequired
When a REST method (or its containing class) is marked with this annotation
requests to it will fail with a 403 response if the instance is not in MASTER
mode (or has recently switched or is still rebinding). Guards the method so
that when it returns the caller can be certain of the response. For example
if the response is 404, then the resource doesn't exist as opposed to
not being loaded from persistence store yet.