Which part of EnterpriseSearch should I use for search bar on Drupal site?

Thank you, that's super helpful. One optional path you could do to make sure you can use our connector alongside the power of App Search would be to use the confluence cloud connector package (8.3.0 release notes | Elastic Enterprise Search Documentation [8.3] | Elastic) that we offered in 8.3. That connector outputs to Workplace Search custom source API, but easily could be modified to output to Elasticsearch bulk indexing API if you like. It's open code so you have full flexibility here. Even if you chose to keep it outputting to Workplace Search, there's still an Elasticsearch index that is powering the content source. You can pull that into App Search using this capability. Elasticsearch index engines (technical preview) | Elastic App Search Documentation [8.2] | Elastic Lastly, I highly encourage you to explore Search UI (in particular this guide) Search UI with Workplace Search | Elastic Documentation This will set you up to use App Search's toolkit with the confluence cloud connector and web crawler in one installation.