The default rescore window uses mainly the number of incoming_link. Incoming link is certainly a very good param but it should be correctly adjusted according wiki size.
We use log(incomingLinks+2), we should review this formula and make sure that it plays nicely with the lucene score.
I tend to think that we should normalize this value against wiki size and maybe use a min/max value to make sure that its impact is not too high.
Example query: https://en.wikipedia.org/w/index.php?title=Special%3ASearch&profile=default&search=chirac&fulltext=Search
Chirac, Lozère is ranked #2 and it's a very small village in lozere france.
Places (even small ones) tend to have a very high number of incoming links. It's because places includes links (see hidden section "Communes of the Lozère department" at the bottom) to other places in the same district.
By disabling boostLinks results are slightly better : https://en.wikipedia.org/w/index.php?title=Special%3ASearch&profile=default&search=chirac&fulltext=Search&cirrusBoostLinks=no