1) How to turn it on? It works on enwiki, but
doesn't seem to work on
srwiki
(f.e. try searching for итацизам that exists in srwiktionary). Doesn't seem
to work on enwiktionary even...
If everything goes well, it'll be enabled on all projects this weekend.
2) Could it also display sister project results if
only a few matches exist
in
current project?
yes, even when there is no match in local wiki, one could get matches from
sister projects.
3) Could it include sister projects in other
languages, of course if all
language projects agree? Obvious application of this are b/h/sh/s wikis,
but
also recently announced Egyptian and classical Arabic, and similar cases.
yes, one can group wikis together in pretty much arbitrary way. The only
limitation is that once wikis are grouped together, all of them get results
from the same group. I grouped them into sister projects because that seemed
most relevant. The only exception currently is
meta-mediawiki.org group. As
for ex-yu languages, I'm not sure if there would be consensus for such a
feature, but if it were, it could be enabled.
r.