Spring boot mongodb #DBRef lazy loading not working for hashsets - spring-boot

Question

Issue: Don't want to fetch the full referenced child objects just the Id.
Partner.java
#Data
#Document
#Builder
public class Partner {
#Id
private String id;
#DBRef(lazy = true) // working as expected
private User user;
#DBRef(lazy = true) // not working, still loads full objects
#Builder.Default
private HashSet<Product> products = new HashSet<>();
}
Product.java
#Data
#Document
#Builder
public class Product {
#Id
private String id;
private Name name;
}
I know that #DBRef is not recommended for such cases. But the project is already built that way and is expensive to change at the moment.
So far tried:
excluding the child array field from the query but then I do not get the Ids as well.
excluding the products.$ref from the query.
#Query(value="{ '_id' : ?0 }", fields="{ products.$ref: 0 }")
Optional<Partner> findByIdWithoutProducts(String id);
Expected:
{
"_id": {
"$oid": "634692559f31e246984436c8"
},
"user": {
"$ref": "user",
"$id": "f689bae8-7442-4355-ae9c-65d22a96ear4"
},
"products": [
{
"$id": {
"$oid": "633d92d2310687496fb852e6"
}
},
{
"$id": {
"$oid": "633d92d2310687496fb852d5"
}
}
}
}
Actual:
{
"_id": {
"$oid": "634692559f31e246984436c8"
},
"user": {
"$ref": "user",
"$id": "f689bae8-7442-4355-ae9c-65d22a96ear4"
},
"products": [
{
"$id": {
"$oid": "633d92d2310687496fb852e6"
},
"name": "abcd" // not wanted
},
{
"$id": {
"$oid": "633d92d2310687496fb852d5"
},
"name": "xyz" // not wanted
}
}
}
My goal is to fetch the parent and just list of Ids of the child objects. Any other way is also appreciated.