Query on multiple collections at once (mongodb)

Question

I'm not pretty sure could I do this. My application(buy and sell) have around five to ten categories eg: vehicles, real estate, and cloths I thought of creating separate MongoDB collections for each category because each of the categories contains with different fields eg: vehicle[km, body type, brand], cloths[size, color, gender] , This would be very easy to manage and scale.

Now can I able to send one query to those multiple collections at once

1. sort new ads - sort all new ads from all multiple collections in order
2. text search on field eg: title on all collections

server: nodejs

Answer 1

MongoDB 4.2 introduces wildcard indexes specifically for this use case.