Merge_base - is it live on gitlab.com?

Hi there,

I’m trying to use the repositories’ merge_base API endpoint for a repo on gitlab.com. I’m getting a 404. I’m fairly new to GitLab, and I’m not sure if the 404 is because I’m using the wrong url/params format, or if merge_base support isn’t actually deployed to gitlab.com yet?

merge_base is in the docs:
https://docs.gitlab.com/ce/api/repositories.html#merge-base

This is the commit that seemed to merge support for the merge_base endpoint 3 days ago: https://gitlab.com/gitlab-org/gitlab-ce/commit/d7c521012f8486c735c7832b58c7d8649b4d6e83

How do I tell if the API on gitlab.com should support merge_base already? How do I troubleshoot if it does?

Thank you,

Tim