help using VcServiceContent and FindAllByUuid

I discovered some very handy builtin methods to find vms by uuid (among other options) called FindAllByUuid but I can't figure out how to use it.

This page had the details

www.vmware.com/support/developer/vc-sdk/visdk41pubs/ApiReference/vim.SearchIndex.html

but i'm going in circles trying to use it. My code is something like this but no combination I can think of works.

var myServiceContent = new VcServiceContent();

myServiceContent.SearchIndex = ??????

myServiceContent.SearchIndex.FindAllByUuid("","42191c8c-ac11-f1f6-9476-d520a64d2305",true,true);

Can anyone tell me how to use the FindAllByUuid?

Thanks