I cannot find the answer to what this feature is... I'm using SharePoint 2010 and this is in the "site settings">"site collection features" menu where this is one of several things you can activate/deactivate. Anyone know?
There is no SharePoint built in feature called "NrbReleaseSearch Feature". My guess is that it is some custom feature deployed to your site. You can see this link to see a list of all the built in features of SP 2010.