public FuzzyDateQueryDescriptor <T> Fuzziness(Time fuzziness) => Assign(fuzziness, (a, v) => a.Fuzziness = v);
 /// <inheritdoc cref="IDateHistogramCompositeAggregationSource.FixedInterval" />
 public DateHistogramCompositeAggregationSourceDescriptor <T> FixedInterval(Time interval) =>
 Assign(interval, (a, v) => a.FixedInterval = v);