I was googling to see what the CompletionSuggester algorithm is. I found the page Extension:CirrusSearch/CompletionSuggester and it says The algorithm used to rank suggestions is still under development. Could someone knowledgeable consider updating that to describe the current algorithm? Thank you.
Topic on Extension talk:CirrusSearch
I think I found the new algorithm described at Help:CirrusSearch#Search suggestions. I'll go ahead and update the aforementioned page.
Thanks for the edit! I removed this bullet from the Limitations and added a more detailed section Ranking criteria.