Exclude Diffusion from search

Due to having a number of Diffusion repositories “observing” large git repos, searching in Phabricator is very slow. This happens when the top-right search field checkbox -> “All Documents” is selected.

Is there any way to exclude the Commits from the search so they are never ever searched?

Is there a way to set “All Documents” to be everything except “Diffusion Commit”?

I looked in the Config section and found “Engine: Search” and “Engine: Index”, but could not find how to do this.

Thank you!