Describe the bug

It seems that the Batch MultiNodeJobDefinition CDK Construct requires instance type to be defined. However, instanceType is not required by the Batch AWS SDK.

This seems to be more than a documentation issue, as I'm unable to create a MultiNodeJobDefinition in my CDK package without specifying instance type.

This constraint takes away from one of the primary advantages to having Batch manage our EC2 resources in that they optimally assign batch jobs to instance types based on availability/resource requirements.

Expected Behavior

We shouldn't need to specify instance type. Batch should determine it based on job resource requirements.

Current Behavior

CDK requires instance type to be required at job definition level.

Reproduction Steps

Create a MultiNodeJobDefinition.

Possible Solution

No response

Additional Information/Context

No response

CDK CLI Version

2.96.2

Framework Version

No response

Node.js Version

18.x

OS

linux

Language

Typescript

Language Version

No response

Other information

No response