Fix elasticsearch test

What does this MR do?

The tests reported in https://gitlab.com/gitlab-org/quality/nightly/issues/127 are now fixed by omnibus-gitlab!3542 (merged), but this one still failed because the default Web IDE commit option was changed: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/31449

So the license file was committed to a branch instead of master and didn't get indexed.

This fix commits the file to master again.

CE MR: https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/32248