Search from custom source

The search endpoint is now as following according to Document

> /v1/search?text=YMCA&sources=oa

and in sources lists in Available search parameters are

> all sources: osm,oa,gn,wof

Now I am inserting a new custom CSV data with headers id, name, lat, lon, type, source. Now if I want to search from this custom data only then what will be the filter?