AWS CDK: Should I be importing the *V2 modules?

Hello.

"aws_elasticloadbalancing" is used when creating a classic load balancer.
Therefore, you need to use "aws_elasticloadbalancingV2" when creating ALB or NLB.
https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_elasticloadbalancing-readme.html

The aws-cdk-lib/aws-elasticloadbalancing package provides constructs for configuring classic load balancers.

Use "aws_apigatewayV2" when creating Websocket and HTTP APIs, and "aws_apigateway" when creating REST APIs.
https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_apigatewayv2-readme.html

This module supports features under API Gateway v2 that lets users set up Websocket and HTTP APIs. REST APIs can be created using the aws-cdk-lib/aws-apigateway module.