Capitalise fields

Hi,
I'm using NEST API to automap poco classes. I need the queried search to return capitalised fields.
eg
RECORDID: {
type: "string"
},

How can I do this? I'm thinking capitalise the properties in the class but elasticsearch automatically camelcases them. The other alternative I guess is to decorate the properties with capitals (which I'm trying to find out how and if that would work)
Any ideas?
Thanks