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and elasticsearch or elasticsearch2 is a destnation driver.

So ES is "some kind of NoSQL" to cite you.
And Kibana is just a GUI which will interact with ES' API.

> And what will be the steps and configurations for the Syslog-NG ?

Reading the official documentation would be a good start:

https://www.balabit.com/sites/default/files/documents/syslog-ng-ose-latest-guides/en/syslog-ng-ose-guide-admin/html/configuring-destinations-elasticsearch.html