I am trying to enable the Rebase merge strategy for my projects in my Bitbucket. I have been following the steps this doc. In my project I have gone to settings > Merge strategies, and only see a field that allows me to select Fast forward, Squash and Merge Commit as a default merge strategy. I don't see any other merge strategy. I am set up as an admin, and I am on the free version. Can anyone tell me where I can enable this feature if at all possible?