Basically, the Nginx OSS version doesn't support 'sticky' directive.

https://docs.nginx.com/nginx/admin-guide/load-balancer/http-load-balancer/

The task at hand is to investigate the best configuration possible with nginx given these limitations to the 'Load balancing' section in our HA guide.

https://docs.wildfly.org/35/High_Availability_Guide.html#load-balancing