Network Load Balancer listener TargetGroup cannot have weight

[abjrcode]

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Terraform CLI and Terraform AWS Provider Version

Terraform version: 1.0.2
AWS Provider Version: 3.49.0

Affected Resource(s)

• aws_lb_listener

Expected Behavior

When creating a listener for a network load balancer it shouldn't specify a weight value for the default forward action in the call to the AWS API.

Actual Behavior

An AWS error saying: You cannot specify a target group weight on load balancers of type 'network'
It has a default value of 1 for default forward action which doesn't work with NLBs

References

• Source code of the listener.

[engineertdog]

Even on v4.38.0, this is still an issue a year later.

Code - https://github.com/hashicorp/terraform-provider-aws/blob/main/internal/service/elbv2/listener.go#L236-L241

This is the first time looking at Go, and this project. So I'm not sure if we'd prefer to just remove the default, or change the default and the validation function.

[jre21]

@ewbankkit This issue has sat untouched for a year and a half, renders the impacted terraform resource unusable, and seems like the fix should be straightforward. Any chance you can take a look at it?