Anyone knows the full text engine name for postgresql?

Anyone knows the full text engine name for postgresql?

I have a AWS ec2 instance running Bitnami OSQA stack(using postgresql), to
implement the full text search, I have tried on my develop server(original
OSQA with mysql).
The problem is, when I add mysqlfulltext in disable session in
Settings_local.py, I can success in my develop server, while in production
server AWS EC2 doesn't work, I know there should be some engine for
postgresql, but don't know the name.
Anyone know this?
--add in the part of OSQA settings_local.py, there is a session as below
DISABLED_MODULES = ['books', 'recaptcha',
'project_badges','mysqlfulltext'],it works fine in my developserver with
mysql, but for product develop server in postgresql, I tries to use
pgsqlfulltext instead but failed for searching.