Type of adjustment to make to a fleet's instance count (see FleetCapacity):
ChangeInCapacity – add (or subtract) the scaling adjustment value from
the current instance count. Positive values scale up while negative values scale down. ExactCapacity – set the instance count to the scaling adjustment value. PercentChangeInCapacity – increase or reduce the current instance count by the scaling adjustment, read as a percentage. Positive values scale up while negative values scale down.