Check if query is using Elasticsearch on testMultipleTests group

[Rahmon]

Description of the Change

Alternate Designs

Benefits

Possible Drawbacks

Verification Process

Checklist:

• I have read the CONTRIBUTING document.
• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have added tests to cover my change.
• All new and existing tests passed.

Applicable Issues

#2335

Changelog Entry

[felipeelia]

@Rahmon overall it looks good but it seems for some tests we are checking if the ep_wp_query_search action was fired (testWPQuerySearchContent() and testWPQuerySearchTitle()) and for the others, we are relying on $query->elasticsearch_success. Is there any difference?

[Rahmon]

@Rahmon overall it looks good but it seems for some tests we are checking if the ep_wp_query_search action was fired (testWPQuerySearchContent() and testWPQuerySearchTitle()) and for the others, we are relying on $query->elasticsearch_success. Is there any difference?

You should rely only on $query->elasticsearch_success. I've updated the PR.