Search is only working for one tree and not searching globaly

[sebastian-muthwill]

Is there a chance to change the behavior of the search function?

In my project I have currently two pages under root with a tree of pages under /de
/blog
/de
/de/dokumentation
/de/faq

This is the current search behavior. When I'm on the blog page and key in a search term then the search is issued like this:
http://127.0.0.1:8000/blog/search/?q=searchterm

and for the other page tree:
http://127.0.0.1:8000/de/dokumentation/search/?q=searchterm
http://127.0.0.1:8000/de/faq/search/?q=searchterm

In all cases only search results are shown within the current path. So for /blog, only blog entries and in /de/dokumentation only the entries in subpages of Dokumentation.

My expectation would be, that the search will find all entries from root. Or at least I can include different pages in the search by setting a checkbox or similar.