These wikis now have Cirrus as a secondary.  You can test it by performing a regular search and then adding "&srbackend=CirrusSearch" to the url.  If you perform another search you'll have to add it back.  Please give it a shot and let me know if you have any problems with it.  Here is a search in frwikisource:
http://fr.wikisource.org/w/index.php?search=Platon&title=Sp%C3%A9cial%3ARecherche&fulltext=1&srbackend=CirrusSearch

If you find the results better let me know and I'll switch you to primary.  If not, please let me know why and I'll fix it.

I'll do this one a week from yesterday.  I should be sending a similar email about it a week from now.

I'll do these November 14th in the evening UTC.  I should be sending an email around this time on November 15th about it.

Around that time I'm going to get hungry for more.  I'll have new servers with tons of head room and WMF folks will start asking me, "When can we turn off the old search?" and I like to be able to answer that with "When no one uses it.  We're adding 6 wikis to Cirrus this week so we'll get there eventually."  What do folks think about adding _all_ wikisources and/or all wiktionaries as secondary?  I've been told that they really need template tranclusion and so the old search isn't really working for them any way.

Otherwise, I'm looking for more volunteers.

Thanks so much,

Nik