Suppose you have a akka stream backed by an ActorPublisher that listens to 
a continuous stream of data from a messaging system
Then how do you cancel this stream ?

When you create the source you pass in the props so you don't have access 
to the actorref. So you can say, send it a Cancel message

Constructing the stream will give you a future and not a Cancellable

I am looking for a way to gracefully shut down without losing any messages

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