Alfresco does not supports to be on root. It has /alfresco and /share
Also we do not support moving Java application to root yet.
If you run the command, it will do nothing, as you can see.
If you don't want to show your users the Bitnami welcome page you can add the following snipet at the top of
Redirect permanent / /alfresco/
And then restart apache with:
sudo /your_installation_dir/ctlscript.sh restart apache