hostname(true) fails in updateAttribute processor

When trying to store details of the host in an attribute using updateAttribute it works with the default ${hostname()} but fails if you attempt to get the FQDN using ${hostname(true)}.  The error reported in the logs is that a ")" or "," is expected.

The VM is operating as a simple endpoint without a domain controller and not listed on any DNS.  No fqdn is listed in hosts file and on command line "hostname" and "hostname --fqdn" both report the same.

This is current preventing me from recording the fqdn that minifi-cpp is collecting data on.