CoC is a paper sheet, which states all the important data of a vehicle. With this paper, you can buy a car, bike, etc for example in Spain, Germany and bring to any other country in the EU and get it registered (like the title in the US or the Fahrzeugbrief in germany).
But it seems, that such a CoC will only exist for vehicles, which has been officially imported and sold through the manufactor and/or their licensed dealership.
I assume, in 2009 or better said a 2009 Indian Chief is not sold buy Indian officially in the UK at this time, so there will be no such document.
Only way to get an accurate data sheet would be the factory, maybe with help from an Indian dealership or from someone who has an already registered motorcycle like that.
Cu,
Sven