Use include_named_queries_score in search template

I'm converting normal queries to template queries, but I require named queries. I get this error when running as a template:

parsing_exception: Unknown key for a VALUE_BOOLEAN in [include_named_queries_score].

Is this not supported? If not, are there other options for this?
"explain" does not seem to do what i want, since it just gives me a list of fields that were hit, but not their score.