Globalsearch: Resolving Logic From Person Type to Country Type

We have a "globalsearch" index that stores "person", "address", "country" information in one single index:


Given type=PERSON and id="PER_001", how can I "map" or query so that I can retrieve the country COUNT_001 details?

Take a look at Join field type | Elasticsearch Guide [8.6] | Elastic, but it's an indexing time thing.