in elasticsearch-model/spec/support/app/searchable.rb [50:59]
def as_indexed_json(options={})
{
title: title,
text: text,
categories: categories.map(&:title),
authors: authors.as_json(methods: [:full_name], only: [:full_name, :first_name, :last_name]),
comments: comments.as_json(only: [:text, :author])
}
end