Y, so I don't know your app, but I want to caution you before you go changing your cluster. Just make sure you do some decent perf testing before you put that change into prod. I've seen ill-conceived clusters many times.
And if you do change it, then you may also need to replace it with an equal NC index.
Watch my free SQL Server Tutorials at:
http://MidnightDBA.com
Blog Author of:
DBA Rant – http://www.MidnightDBA.com/DBARant