Load balancer algorithm of bitnami nginx ingress

I do install the ingress controller via helm and the Nginx ingress controller from bitnami, I pretty sure the bitnami use the kubernetes/ingress-nginx from here https://github.com/kubernetes/ingress-nginx

i read an article that said that the default algorithm for ingress is round-robin. So i have checked the detail, but I Lil bit doubt because it shows the EWMA algorithm there.

root# kubectl exec ingress-controller-nginx-ingress-controller-ldqz4 -n ingress -- nginx -T |more

2022/03/16 08:17:53 [warn] 87#87: the "http2_max_field_size" directive is obsolete, use the "large_client_header_buffers" directive instead in /opt/bitnami/nginx/conf/nginx.conf:143

nginx: [warn] the "http2_max_field_size" directive is obsolete, use the "large_client_header_buffers" directive instead in /opt/bitnami/nginx/conf/nginx.conf:143

2022/03/16 08:17:53 [warn] 87#87: the "http2_max_header_size" directive is obsolete, use the "large_client_header_buffers" directive instead in /opt/bitnami/nginx/conf/nginx.conf:144

nginx: [warn] the "http2_max_header_size" directive is obsolete, use the "large_client_header_buffers" directive instead in /opt/bitnami/nginx/conf/nginx.conf:144

2022/03/16 08:17:53 [warn] 87#87: the "http2_max_requests" directive is obsolete, use the "keepalive_requests" directive instead in /opt/bitnami/nginx/conf/nginx.conf:145

nginx: [warn] the "http2_max_requests" directive is obsolete, use the "keepalive_requests" directive instead in /opt/bitnami/nginx/conf/nginx.conf:145

nginx: the configuration file /opt/bitnami/nginx/conf/nginx.conf syntax is ok

nginx: configuration file /opt/bitnami/nginx/conf/nginx.conf test is successful

# configuration file /opt/bitnami/nginx/conf/nginx.conf:



# Configuration checksum: 14885012042408604827



# setup custom paths that do not require root access

pid /tmp/nginx.pid;



daemon off;



worker_processes 1;



worker_rlimit_nofile 1047552;



worker_shutdown_timeout 240s ;



events {

    multi_accept        on;

    worker_connections  16384;

    use                 epoll;

}



http {

    lua_package_path "/etc/nginx/lua/?.lua;;";

    

    lua_shared_dict balancer_ewma 10M;

    lua_shared_dict balancer_ewma_last_touched_at 10M;

    lua_shared_dict balancer_ewma_locks 1M;

    lua_shared_dict certificate_data 20M;

    lua_shared_dict certificate_servers 5M;

    lua_shared_dict configuration_data 20M;

    lua_shared_dict global_throttle_cache 10M;

    lua_shared_dict ocsp_response_cache 5M;

    

    init_by_lua_block {

        collectgarbage("collect")

this is my nginx.conf and located in /etc/nginx/nginx.conf

root# cat /etc/nginx/nginx.conf 

user www-data;

worker_processes auto;

pid /run/nginx.pid;

include /etc/nginx/modules-enabled/*.conf;



events {

    worker_connections 768;

    # multi_accept on;

}



http {



    ##

    # Basic Settings

    ##



    sendfile on;

    tcp_nopush on;

    types_hash_max_size 2048;

    # server_tokens off;



    # server_names_hash_bucket_size 64;

    # server_name_in_redirect off;



    include /etc/nginx/mime.types;

    default_type application/octet-stream;



    ##

    # SSL Settings

    ##



    ssl_protocols TLSv1 TLSv1.1 TLSv1.2 TLSv1.3; # Dropping SSLv3, ref: POODLE

    ssl_prefer_server_ciphers on;



    ##

    # Logging Settings

    ##



    access_log /var/log/nginx/access.log;

    error_log /var/log/nginx/error.log;



    ##

    # Gzip Settings

    ##



    gzip on;



    # gzip_vary on;

    # gzip_proxied any;

    # gzip_comp_level 6;

    # gzip_buffers 16 8k;

    # gzip_http_version 1.1;

    # gzip_types text/plain text/css application/json application/javascript text/xml application/xml application/xml+rss text/javascript;



    ##

    # Virtual Host Configs

    ##



    include /etc/nginx/conf.d/*.conf;

    include /etc/nginx/sites-enabled/*;

}





#mail {

#   # See sample authentication script at:

#   # http://wiki.nginx.org/ImapAuthenticateWithApachePhpScript

#

#   # auth_http localhost/auth.php;

#   # pop3_capabilities "TOP" "USER";

#   # imap_capabilities "IMAP4rev1" "UIDPLUS";

#

#   server {

#       listen     localhost:110;

#       protocol   pop3;

#       proxy      on;

#   }

#

#   server {

#       listen     localhost:143;

#       protocol   imap;

#       proxy      on;

#   }

#

I want to edit or configure the load balancer algorithm, but I don't know if mine configured correctly or not. but i tries to run kubectl apply -f filename , it showed configured but nothing happen. nothing change.

apiVersion: networking.k8s.io/v1

kind: Ingress

metadata:

  name: nginx-ingress

  namespace: ingress

  annotations:

    nginx.ingress.kubernetes.io/load-balance: "least_conn"

spec:

  ingressClassName: nginx

  rules:

  - host: mywebsite.com

    http:

      paths:

      - path: /

        pathType: Prefix

        backend:

          service:

            name: service2

            port:

              number: 80

      - path: /video

        pathType: Prefix

        backend:

          service:

            name: service2

            port:

              number: 80

      - path: /service3

        pathType: Prefix

        backend:

          service:

            name: service3

            port:

              number: 80