unsubscribe method
Unsubscribe from server-side filtered updates for a collection.
Removes the filter subscription, causing the server to stop sending filtered updates for this collection. The collection will still sync normally based on local changes.
Example:
realmSync.unsubscribe('tasks');
Implementation
void unsubscribe(String collectionName) {
_subscriptionsByCollection.remove(collectionName);
socket.emit('sync:unsubscribe', {'collection': collectionName});
}