Ah. I see. Thanks. My bad.
So the short version is that since it's still a beta GeoTools, GeoServer will have to wait for it to be "non-beta" in GeoTools before using it in a official release? That's why it's being tagged as 2.9.x?
Is 2.8.x bound to a specific version of GeoTools?
Correct. GeoServer 2.8.x uses GeoTools 14.x
By the way, it does not mean it cannot be backported, but it's mandatory to wait one month before doing the backport. And we could really use someone to test this functionality on the 2.9.x series with real world data (it has been tested of course, but with limited data sets).
Mass closing all resolved issues not modified in the last 4 weeks