public ExpDateTimePointFunction(string field, TimeUnit scale) : base(field, scale, "exp") { }
		public GaussDateTimePointFunction(string field, TimeUnit scale) : base(field, scale, "gauss") { }
 protected DateTimeDecayBaseScoreFunction(string field, TimeUnit scale, string decayType)
 {
     _field = field;
     _scale = scale;
     _decayType = decayType;
 }
		public LinearDateTimePointFunction(string field, TimeUnit scale) : base(field, scale, "linear") { }
		public ScanAndScrollConfiguration(TimeUnit lengthOfTime, int size)
		{
			_lengthOfTime = lengthOfTime;
			_size = size;
		}