There is an update for Windows 8.1 (KB 2919355). Does Windows Server 2012 R2 have its own update with similar features? I cannot seem to find any information.
The Update is the same for Windows 8.1 and Server 2012 R2:
Windows RT 8.1, Windows 8.1, and Windows Server 2012 R2 Update: April 2014
Here is a document which explains what is new for Server 2012 R2:
Windows Server 2012 R2 Update