The subscribed threads workaround I described below might help:
This doesn't depend on the indexing being up to date, but works in real-time like the forum index does.
Yes, and thanks ed1. It was helpful, but still many discussions I post in do not stay active as long as in the past. It used to be I would see active discussions in old posts quite frequently, but now once they seem buried by multiple pages it is becoming less likely that they are being read. Im just saying that the search function seems to be limiting ongoing discussion mostly to issues at the top of each forum; but perhaps my situation is unusual. Although this only started once the new search came about.