It seems that forums' search index DB has fixed size and "forgets" old fulltext data which is older than a half-year. It's a bit funny since search function has older date range, like 3 years.
An example:
Divinity 2 - Ego Draconis (English) » Divinity 2 - Ego Draconis section has a thread named as "
upcoming patch" which is definitely not over 3 years old, but know what? You can't find it when don't know
exact name, no matter how hard you try, no matter what date range you specify, no matter what wildcard mask is (even *patch* does not work).
Can someone from forum tech-admins fix that?