Automated Functional test for facets module integration

Problem/Motivation

Elasticsearch Connector mentions that we integrate with the Facets module → on the front page. We also now have a manual test in our documentation for Developing the Facets module integration → .

We should make sure this integration does not regress!

Proposed resolution

See if there are any existing automated tests for the Facets module.

Add "drupal/facets": "^3" to Elasticsearch Connector's "require-dev".

Transform the manual test in our documentation → into an automated test.

Once merged, update the documentation → (likely, many of the Setup steps will no longer be necessary).

Remaining tasks

1. Write a patch
2. Review and feedback
3. RTBC and feedback
4. Commit

User interface changes

None.

API changes

None.

Data model changes

None.