How field's "Advanced searchable" property works?

Hey all!
What's the "Advanced searchable" property functions of field?

I'm afraid this is a dummy property - there's no functionality attached to it at the moment and it's in there just for future reference for next versions of the component (Couldn't find post by Emmanuel on the forums where he describes this).
If you are developing own extension for Flexicontent, you can check if the field is true and use it now.