Can you clarify what you mean regarding the GET request where you say the request is captured, but the response data is not recorded.
Does this mean that you are calling the request using Postman, you can see the request in your ELK logging, but no response is returned to Postman?
Does the Postman application report any kind of error, or logging, or anything of that nature?
Note that we can’t really provide support on your infrastructure, but I’d be willing to chat a little more to see where the problem might be coming from.