Doc: Update Logstash reference to cloud related terms

Related: https://github.com/elastic/platform-docs-team/issues/366

PRs:
- [x] https://github.com/elastic/logstash/pull/17653
- [x] https://github.com/elastic/logstash-docs-md/pull/22
- [x] `logstash-plugins` org
     - [x] https://github.com/logstash-plugins/logstash-output-elasticsearch/pull/1212
- [x] https://github.com/elastic/docs/pull/3221/

