Microsoft’s Tip of the Day has the following useful information on Domain Controller File Replication Service (FRS) depercation:
FRS (File Replication Service) has been deprecated in Windows Server 2012 R2. The deprecation of FRS has been accomplished by enforcing a minimum domain functional level of Windows Server 2008. This enforcement is present only if the new domain is created using Server Manager or PowerShell. DCPromo still exists and is used by unattended installations. Such domains can still be created at a lower domain functional level.