docs: def search_alternative(self, limit, **kwargs):
          """Replace $search with $in for mongodb v2.4.
  
          This is a workaround for mongo v2.4 not supporting the $search keyword.
          This workaround is hardcoded specifically for the 'q' query param. The
          text search is executed first and the ids of the found documents are
          used to replace the $search filter with a $in filter.
          """
          search_term = kwargs['$or'][0]['$text']['$search']
          response = self._collection.database.command(
              'text', self._collection.name,
              search=search_term,
              project={'_id': 1},
              limit=limit
          )
          id_list = [e['obj']['_id'] for e in response['results']]
          kwargs['$or'][0] = {'_id': {'$in': id_list}}
          return kwargs