Support the Combined Fields query type

[mparker17]

The Combined Fields query type was introduced in ElasticSearch 7.13.

See
https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl-combined-fields-query.html for more information.

A combined fields query is useful for frameworks like Drupal, which store data in structured fields.

[ruflin]

@mparker17Interested to contribute?  😇

Update: Nevermind, just saw #2196 Thank you!