removal
RemovalPolicy is used to select the ECS instances you want to remove from the scaling group when multiple candidates for removal exist. Optional values:
OldestInstance: removes the ECS instance that is added to the scaling group at the earliest point in time.
NewestInstance: removes the ECS instance that is added to the scaling group at the latest point in time.
OldestScalingConfiguration: removes the ECS instance that is created based on the earliest scaling configuration.
Default values: Default value of RemovalPolicy.1: OldestScalingConfiguration. Default value of RemovalPolicy.2: OldestInstance.