algorithms Apriori, FPgrowth

Hello experienced mahout users,

I am new to mahout library and I have a bit trouble to find a starting
point for "associative rule mining" as I don't see neither Apriori not
FPgrowth algorithm on the list of implemented algorithms. Contrary I found
several blog posts with referal to mahout library for implementation of
those algorithms.
I am a bit confused what the current state is and where to find appropriate
docs.

Any hint would be appreciated.

Thanks
Jakub