def determine_stored_fields(options = {})
      stored_fields = options[:lazy]
      if stored_fields && !(Array === stored_fields)
        stored_fields = index_definition[:ferret_fields].select { |field, config| config[:store] == :yes }.map(&:first)
      end
      logger.debug "stored_fields: #{stored_fields.inspect}"
      return stored_fields
    end
def determine_stored_fields(options = {})
      stored_fields = options[:lazy]
      if stored_fields && !(Array === stored_fields)
        stored_fields = index_definition[:ferret_fields].select { |field, config| config[:store] == :yes }.map(&:first)
      end
      logger.debug "stored_fields: #{stored_fields.inspect}"
      return stored_fields
    end
retrieves stored fields from index definition in case the fields to retrieve
 haven't been specified with the :lazy option