Upgrade platform Coretto 11

Hello, We have an application on elastic beanstalk which is on a java 8/Amazon linux 1 platform. A few months ago Amazon sent us an email telling us that Amazon linux 1 will no longer be supported by the end of June.

We tried to recreate an environment on the Correto 11/Amazon linux 2 platform, and although the site is accessible and the requests go through, the application status is still indicated as severe.

Here are the causes :

1. Overall:

100.0 % of the requests are erroring with HTTP 4xx. Insufficient request rate (12.0 requests/min) to determine application health. ELB processes are not healthy on all instances. ELB health is failing or not available for all instances.

2. i-07a5c574732d43842:

100.0 % of the requests are erroring with HTTP 4xx. Insufficient request rate (12.0 requests/min) to determine application health. Process default has been unhealthy for 2 days (Target.ResponseCodeMismatch).\nProcess secure has been unused for 2 days (Target.NotInUse).

Is there something we can do?

Thank you in advance for your help.