Looks like Solr 4.4.0 didn't include SOLR-4718 which rely upon. Luckily the 4.5.0 voting is going on right now which makes it a perfect timing for us.
Re-opening the issue and changing the version to 4.5.0
Attaching a patch that currently pulls the most recent RC of Solr 4.5.0.
Would like to request that we commit this ASAP, test it and once they release follow up with a patch to bind to the actual released artifacts.