public Task Unsubscribe(Type eventType, ContextBag context)
{
var topicsToUnsubscribe = GetTypeHierarchy(eventType);
var consumer = messagePump.GetEventsConsumerHolder().GetConsumer();
var subscriptionList = consumer.Subscription;
subscriptionList = subscriptionList.Where(t => !topicsToUnsubscribe.Contains(t)).ToList();
consumer.AddSubscriptions(subscriptionList);
return(Task.FromResult(0));
}