In Katello, there has been a recent conversion to scoped search for subscriptions https://github.com/Katello/katello/pull/5446 that is now part of master. It moves subscription and pool data to the database and includes migrations.
If you have an existing environment that needs updating you will need to rake db:migrate and rake katello:upgrades:2.4:import_subscriptions to import subscription data into the database.
Feel free to contact me with any questions.
-John
-- John Mitsch
Red Hat Engineering
860-967-7285
irc: jomitsch