When searching for something, if its in another namespace that is set
to be searched by default, it will find it (eg: searching for Images,
and you have a page by that name in another NS such as help) and will
list it as the first result but it won't auto redirect to the pae if
that is what you're talking about, There is currently a open bug[1]
about that.
-Peachey
[1].
https://bugzilla.wikimedia.org/show_bug.cgi?id=11380