Coming out of the discussion around back compatibility, it seems best to default StandardAnalyzer to properly fix
LUCENE-1068, while preserving the ability to get the back-compatible behavior in the rare event that it's desired.
This just means changing the replaceInvalidAcronym = false with = true, and, adding a clear entry to CHANGES.txt that this very slight non back compatible change took place.
Spinoff from here:
I'll commit that change in a day or two.