Thread:Extension talk:Lucene-search/Multilanguage wiki farm that searches multiple databases?

Our multilanguage wiki farm (one database per wiki, one single code tree) has a lucene config (below) where each host searches only the content in its own database. How can we change this so one of the sites (say, "fr") searches not only its own database (fr_wikidb), but also a second database (en_wikidb)? Thanks.

[Database] en_wikidb : (single) (spell,4,2) (language,en) de_wikidb : (single) (spell,4,2) (language,de) fr_wikidb : (single) (spell,4,2) (language,fr)

[Search-Group] myhost : *

[Index] myhost : *

[Index-Path] : /search

[OAI] : http://myhost/w/index.php en_wikidb : http://en.myhost.net/w/index.php de_wikidb : http://de.myhost.net/w/index.php fr_wikidb : http://fr.myhost.net/w/index.php