Better search by department answering

[ajparsons]

One of the use cases of alerts as political monitoring is to create an email alert for questions answered to to create email alerts for announcements from a particular department.

This can be done through creating an alert for a specific person, but people change jobs, and jobs change name.

Is there a simple approach to this: like a filter of "role_contains:minister,justice" that builds on data we already have but don't expose in search?