Is there a way to return _scores when using es_query or es_match?

It has been mentioned in #287
Was this possible in previous versions, or is it possible to specify a parameter that will add `_score` to results of `es_query` or `es_match`?

Start by reading the referenced issue #287, then trace the es_query and es_match entry points to see how result fields are selected. Determine whether _score can be exposed consistently and what parameter or result shape would be appropriate; the issue does not name files or tests, so the expected API and completion criteria need clarification.

Written by the indexing model from the issue text.