Negation in condition while sending FCM message : <p>I am subscribing to a topic which is my application version in Android.</p>

<pre><code>FirebaseMessaging.getInstance().subscribeToTopic(APP_VERSION);
</code></pre>

<p>Now every time I launch an update, I have to unsubscribe to an old version and subscribe to a new version so if I send an update notification only old users will get it. Instead, it would be great if I just negate a version.  </p>

<pre><code>"condition": "!'2.1.1' in topics",
</code></pre>

<p>Is something like this exists in FCM?</p>
