Search suggest not working on some xwiki.org wikis

Issue reported by vmassol

Search suggest fails on subwikis like:

• platform: http://platform.xwiki.org/xwiki/bin/view/DevGuide/Scripting
• dev: http://dev.xwiki.org/xwiki/bin/view/Community/DevelopmentTools

Still, the suggest if working on wikis like:

• main wiki: http://www.xwiki.org/xwiki/bin/view/ReleaseNotes/
• design: http://design.xwiki.org/xwiki/bin/view/Proposal/Clusteringsupportinthescheduler