Using NGINX as a Load Balancer

I created an Elasticsearch Cluster with 3 Elasticsearch nodes. All nodes are of type master.

They are configured to maintain high availability, one node receives data and replicates it to the other two.

For load balancing I use NGINX, with the configuration below:

## Custom certificate
ssl_certificate /etc/ssl/myapp/nginx-elk.crt;
ssl_certificate_key /etc/ssl/myapp/nginx-elk.key;

upstream elk {

server {
    listen 443 ssl;
    server_name; //Public Internet IP
    add_header X-Frame-Options "SAMEORIGIN";
    add_header Strict-Transport-Security "max-age=31536000; includeSubdomains; preload";

    location / {

        proxy_pass https://elk;
        proxy_set_header Host $host;
        proxy_set_header X-Real-IP $remote_addr;
        proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;

        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";

    access_log /var/log/nginx/ proxylog;

My NGINX server has this Keep Alive setting in nginx.conf

events {
        worker_connections 50000;
        # multi_accept on;

http {

        # Basic Settings

        sendfile on;
        client_max_body_size 100M;
        tcp_nopush on;
        tcp_nodelay on;
        keepalive_timeout 65;
        types_hash_max_size 2048;
        server_tokens off;

Do I have to do some other configuration to guarantee performance on access?

I use the VMs local IP to query the ELK and not the public IP. I only use the public IP via the internet in some cases.

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