Show parent or child only in a search for Elasticsearch

Question

I’m a beginner in the world of Elastic and I have some doubts about relationships.

I have configured in my Mapping the following relation:

"relacao":{
    "type": "join",
    "relations":{
       "pai":"filho"
    }
}

Follow an example of doc son: https://i.imgur.com/dcugdlN.png

And one from Doc Dad: https://i.imgur.com/mv6LAS7.png

When performing a search, as the products have the same name the correct Elastic would display both (father and son)? In case I wanted only one of them to appear, and preferably always the product with stock, it is possible?

Elasticsearch 6.4 PHP 7.2