Note
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Checkout KB2920151 for getting a comprehensive list of the recommended hotfixes and updates for clusters based on Windows Server 2012 R2
https://support.microsoft.com/kb/2920151/en-us
+ Checkout Rollup Update June which includes several Hyper-V and Cluster relevant patches too.
https://support.microsoft.com/kb/2962409/en-us
Same exists for Windows 2012 RTM based clusters too
https://support.microsoft.com/kb/2784261/en-us
Also take a look at the Cluster-Aware Updating feature which is introduced in 2012 R2 –> Cluster-Aware Updating Overview
….Stay tuned ;)