code: def get_count(cls, date_field=None, start=None, end=None, filters={}):
          
          """ Total number of items """
          query_basic = cls.__get_query_basic(date_field=date_field,
                                              start=start, end=end,
                                              filters=filters)
          # size=0 gives only the count and not the hits
          query = query_basic.extra(size=0)
          return query
docs: Build the DSL query for counting the number of items.
  
          :param date_field: field with the date
          :param start: date from which to start counting, should be a datetime.datetime object
          :param end: date until which to count items, should be a datetime.datetime object
          :param filters: dict with the filters to be applied
          :return: a DSL query with size parameter