[META] Identify, evaluate, and action Beats content and recommendations for Logstash content

[karenzone]

Current offerings -- Elastic Agent, Elastic integrations, and the [logstash-filter-agent_integration](https://www.elastic.co/guide/en/logstash/master/ea-integrations.html -- might give users better ways to achieve the same or better results.

Phase 1: Locate Beats content in Logstash docs

• To be completed...
• Instance 1...
• Instance 2...

Phase 2: Evaluate content and make recommendations

Q: Is there another way to achieve the same or better results with Agent and integrations?
Q: Would we want a new user implementing this approach now?

Phase 3: Implement recommendations

@karenzone et all
Related:

• Doc: Messaging for Logstash module deprecations #16590
• Doc: Evaluate and action Beats module messaging and deprecation #16591