I know this is quite old, and we've all grown up and had kids now, but I posted a solution last December that might be applicable here (WARNING it might not perform well on very large sets of data).
Basically you create a new scripted field for each of your "statuses" and set them to 1 if they match the name of that status. See;
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but I posted a solution last December that might be applicable here (WARNING it might not perform well on very large sets of data).