Another weird quirk is that when I run the search on 7.1.0 I get no results in fast mode, unless I add | table * , in which case I then get results.
I would like to know what changed around this so that I can figure out to what extent it could affect reports, alerts, and dashboards.
Edit: This does seem limited to a specific sourcetype, I can run a similar search in Fast Mode on another sourcetype and it works as it did before.
Edit2: This is not limited to a specific sourcetype. The reason it was working on the other sourcetype is that the search was able to do a raw text search for testfield=123 and find it. In my scenario a raw text search does not work.