It looks like it should be working. I know some people were downgrading the search assistant, maybe this is why?
Is file manager renamed or missing? You can also swipe down in search and use settings to launch bbry assistant. Then you can check individual search settings. Try unclearing all and press OK. Then readd all and press OK.
I haven't downgraded search assistant neither is file manager renamed. Thats not the only application most android apps are not coming in the search either.
It use to work perfectly in 10.2.1 with 10.3.1 I seem to have no clue how to get it to work.