Test changelogs

[lcawl]

This PR tests some changelogs, which were created like this:

1. Install docs-builder
2. Create a changelog configuration file (based on https://github.com/elastic/docs-builder/blob/main/config/changelog.example.yml).
3. Create some changelogs. Since they don't currently have labels that obviously map to "types" or "areas", I've specified "other" and "Elasticsearch Output" expliclity:

   docs-builder changelog add --products "logstash 9.3.0" \
   --config ./docs/changelog.yml --output ./docs/changelog \
   --use-pr-number --strip-title-prefix \
   --prs https://github.com/logstash-plugins/logstash-output-elasticsearch/pull/1232 \
   --type other --areas "Elasticsearch Output" 
   
   docs-builder changelog add --products "logstash 9.3.0" \
   --config ./docs/changelog.yml --output ./docs/changelog \
   --use-pr-number --strip-title-prefix \
   --prs https://github.com/logstash-plugins/logstash-output-elasticsearch/pull/1228 \
   --type other --areas "Elasticsearch Output" 

Questions

• Does this use of "type: other" make sense, or should these PRs actually be "bug-fix", "enhancement", or something else?
• Does it make sense that "Elasticsearch Output" is an area or should it be a product? If the latter, this will require changes to https://github.com/elastic/docs-builder/blob/main/config/products.yml