you get 302 when performing URL redirection, any ELB Health check will look for success code 200 for the health check to pass. In ALB, this can be configured under health check in the ELB console.

To modify the health check settings of a target group using the console

1. Open the Amazon EC2 console at https://console.aws.amazon.com/ec2/.
2. On the navigation pane, under LOAD BALANCING, choose Target Groups. Select the target group.
3. On the Health checks tab, choose Edit.
4. On the Edit target group page, modify the setting Success Codes to 302 or as needed, and then choose Save.

add this annotation in your ingress controller it will modify the success code and nodes will be in healthy state.

alb.ingress.kubernetes.io/success-codes: 200,404,301,302

I run into the same issue recently, and as suggested by @SudharsanSivasankaran we have edited the health check settings at the target level.

But we have kept the 200 only status code and instead updated the path to directly hit the page the redirection goes to.

For instance if a website hosted under instance:80 needs the user to be logged on and redirect it to the /login page, all we need to do is add the /login path in the health check.