We've implemented and crawled a Business Data Connectivity Service data source. I can find the items based on the values in their fields, but when I look at Crawled Properties, there is only the default EntityName(Text) and EntityNamespace(Text) properties available. None of the fields of the items show up as they should.
Figured it out thanks to this post.
Now when you are in the FAST Query Search Service Application, don’t click on the Metadata properties link in the left menu, ‘these aren’t the search properties you’re looking for’ /waveshand.
I was looking at Crawled Properties under FASTQuerySSA, while I should have looked under Search Service Application.