Using a forced shutdown is strongly discouraged as it can result in major issues, specifically if this happens during a system upgrade.
In the worst case, the filesystem may become corrupted and you should be prepared to lose the data and be ready to reinstall the system.
Even if you are lucky to avoid the worst case scenario, interrupted system upgrade still leads to inconsistent RPM database, unfinished transactions, duplicates, dependency related issues, possibly even SELinux labeling issues, all of which need to be properly diagnosed and addressed.
You should start with post upgrade tasks and see how it goes:
Post-upgrade tasks :: Fedora Docs
Also take care of the following to avoid future problems:
Possible upgrade issues on systems with <=1 GB /boot partition