Load Balancer forward IP

So I have a load balancer with some web services.

I have ELK monitoring all the web services and containers.

ALL my services show the “host” in the access log being the load balancers internal IPSEC IP address.

How can I make HAProxy send/forward the correct users IP for my web services and ELK stack to monitor correctly.

Thanks,

For a HTTP balancer listener the original client IP is added as a X-Forwarded-For header.