Hi @Paul_Calhoun,
Is it possible to switch from 4.4 to 5.0 and then switch BACK if something goes wrong with our testing ?
You will not be able to revert your cluster back to MongoDB version 4.4 if it is upgraded to MongoDB version 5.0 as you cannot downgrade a cluster’s MongoDB version noted on the documentation here. You should receive a warning in the UI stating that you cannot downgrade from 5.0 if you try select this option in the Edit Configuration option as shown below:
However, the recommended best practices for major version upgrades documentation contains a procedure on how to set up a staging cluster (if you do not already have a staging cluster) so that you can test your application(s) against newer version(s) of MongoDB.
Hope this helps!
Regards,
Jason