docs: def get_percentiles(self, field=None, percents=None):
          """
          Create a percentile aggregation object and add it to the aggregation dict
  
          :param field: the field present in the index that is to be aggregated
          :param percents: the specific percentiles to be calculated
                           default: [1.0, 5.0, 25.0, 50.0, 75.0, 95.0, 99.0]
          :returns: self, which allows the method to be chainable with the other methods
          """
  
          if not field:
              raise AttributeError("Please provide field to apply aggregation to!")
          if not percents:
              percents = [1.0, 5.0, 25.0, 50.0, 75.0, 95.0, 99.0]
          agg = A("percentiles", field=field, percents=percents)
  
          self.aggregations['percentiles_' + field] = agg
          return self