Find how to execute Elastic queries within MediaWiki PHP

[malberts]

Additional ElasticSearch queries needs to be done to get the facet values and counts for the current search result.

Determine how this can be done via:

• CirrusSearch extension; or
• Elastica extension; or
• ruflin/elastica dependency

[JeroenDeDauw]

WikibaseCirrusSearch is using some query DSL provided by ruflin/elastica. We might need to be able to run complex queries. See the "script" in https://github.com/ProfessionalWiki/WikibaseFacetedSearch/issues/23#issuecomment-2508655267. Perhaps this creates complications or restricts what part of the DSL we use.