Add document filters based on application to the search string

[MarkIannucci]

Is your feature request related to a problem? Please describe.
Wouldn't it be sweet to type:
uw max server memory af:clarity,caboodle
and have the userweb return documents filtered by the Clarity and Caboodle applications

Additional context
this won't be fun to implement because Epic's approach to this is to use magic numbers in the search string... so you should probably wait to implement this until after you get the work done to throw a page at people when they click on the magnifying glass