All,
lsearchd/MWSearch has powered Wikimedia search for many now. With
the successful deployment of Elasticsearch/CirrusSearch to all wikis we've
completed the migration and lsearchd has reached its end of life and is
no longer being supported in development or usage. Any 3rd party users
of MWSearch are encouraged to use CirrusSearch which attempts to
remain largely compatible with behavior in MWSearch.
I didn't want to break any gadgets or scripts, so I checked the API logs
going back about a month. enwiki, ruwiki and nlwiki still have a bit of
traffic using the old search backend so I left them enabled. lsearchd has
been disabled on all other Wikimedia wikis though and is now in ops'
hands for decomissioning. Once any bot/tool/etc authors using the old
search are contacted (and helped, if possible) lsearchd will go away there
too.
lsearchd is dead. Long live Elasticsearch.
-Chad