Following the documentation for installation, I'm getting not found on the regular and oss repositories?
I'm not the first to experience this in 2021.
Has the OS installation method been deprecated but not removed from the documentation?
Welcome to our community! 
You've posted a link to the Filebeat docs but this is in the Elasticsearch category, I just want to make sure what product you are asking about here.
My mistake - I came back to delete the post. I had mis-configured my nic for internal only, sorry.
No worries, glad you fixed it 