Code Manager deployments fail with a "Cannot lock" or "Index is locked" error in Puppet Enterprise 2016.x to 2018.1.x

Code deployments in Puppet Enterprise fail with a "Cannot lock" or "Index is locked" error. Error messages 2017.x and 2018.1.x 2017-09-07T11:27:38.813759-04:00 frup7682 puppetserver[6337]: Exceptio...