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Text search only afaik.
However, you could query the index directly using the service url - http://{serviceUrl}/{defaultIndex}/_search
Thanks Per, didn't think of that.
I'll use Fiddler to catch me some example JSON to use ase a template for query post data and go from there.
How about using Powerslice? Its not extending the FInd UI - which isn't really supported, but it would give your Episerver users the ability to do more advanced filter like searches.
http://world.episerver.com/articles/items/re-introducing-powerslice-for-episerver-cms/
How do I write a filter expression to find documents matching a certain property using the Episerver Find index explore UI.
E.g. documents that have