Elastic Stack consists of Elasticsearch, Logstash, and Kibana. 

Elasticsearch is a distributed, real-time search and analytics engine that is used to store and index log data.

 Logstash is a data collection and processing pipeline that ingests log data and sends it to Elasticsearch.

 Kibana is a user-friendly visualization tool that allows you to interactively explore and analyze the log data in Elasticsearch. Hadoop is not a component of Elastic Stack. 

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server {

    listen 80;

​

    server_name your_domain;

​

    auth_basic "Restricted Access";

    auth_basic_user_file /etc/nginx/htpasswd.users;

​

    location / {

        proxy_pass http://localhost:5601;

        proxy_http_version 1.1;

        proxy_set_header Upgrade $http_upgrade;

        proxy_set_header Connection 'upgrade';

        proxy_set_header Host $host;

        proxy_cache_bypass $http_upgrade;

    }

}

https://quintagroup.com/services/the-elastic-stack-and-its-components-elasticsearch-kibana-logstash-and-beats