Hello John,
If NameID is properly configured, you will not see it's value clear text in SAML assertion of Gluu Server, basically that's how Shibboleth works.
On other hand... you will see something like "NameID configured .. etc. etc " in SAML assertion OR "NameID can't be configured ....".
SAML assertion means... DEBUG log from 'idp-process.log' ( /opt/shibboleth/logs/ )