instanceType
The Amazon EC2 instance type to use for all instances in the fleet. For multi-location fleets, the instance type must be available in the home region and all remote locations. Instance type determines the computing resources and processing power that's available to host your game servers. This includes including CPU, memory, storage, and networking capacity.
By default, Amazon GameLift Servers uses the c5.large instance type. If this instance type does not have sufficient resources for your container groups, you can choose a different instance type that better fits your needs. See Amazon Elastic Compute Cloud Instance Types for detailed descriptions of Amazon EC2 instance types.
You can't update this fleet property later.