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

Current offerings -- [Elastic Agent](https://www.elastic.co/guide/en/fleet/current/index.html), [Elastic integrations](https://www.elastic.co/docs/current/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:
- #16590
- #16591