Now i have a group which have more than ten thousand members and for a group i have created a topic(Notification topic) where all the users in the group subscribed to that t
Even though this question is already answered and a bit old, there's a workaround. So therefore I will still add the answer for future reference. What you can do is unsubscribe the user from the topic, send the message to the topic and subscribe the user once again. Sure that is a bit more work and calls to Firebase, but then you've got what you want.
Just a thought