It used to be Google Sites (then part of Google Apps for Business which is now GSuite), Docs and Slides which were indexed by an internal Google search engine c

It used to be Google Sites (then part of Google Apps for Business which is now GSuite), Docs and Slides which were indexed by an internal Google search engine called MOMA (which I believe was powered by the Google Search Appliance, but my recollection on this last point is faint)