Please note that Bitnami Stacks are self-contained and include every component they need (such as Apache or MySQL), and they don't interfere with the rest of components of the system. Therefore, you shouldn't use the another service installed using the System Packages (apt-get, yum, etc).
/opt/bitnami/ctlscript.sh to manage all the service in the Bitnami installation. By default, we use the name of the service to manage an specific one (myslq, apache, elasticsearch...).
Regards and Happy New Year