Hello,
I already have a cluster containing hot and master nodes, and I want to add 4 Cold nodes.
Do I need a license for this, and what are the steps to follow?
Thank you
As far as I can read the Subscriptions | Elastic Stack Products & Support | Elastic page, it says that Searchable Snapshots are available with the Enterprise level license.
So yes, you need a commercial license for this if you are running on premise.
Note that you can test that before running in production using the trial license you can activate for 30 months from Kibana. I'd suggest not doing that in production directly 
what are the steps to follow?
You need to use the contact form.
HTH
1 Like
Thank you @dadoonet