Spring Data Rest: Relations to exported Repositories are handled as if they were embedded

[mathias-ewald]

Describe the bug
When I create 2 entities A and B with a relation from A to B, the generated api doc describes the relation as B being embedded in A instead of modelling an href to another entity.

To Reproduce
Spring Boot: 2.4.3
Springdoc: 1.5.5

public class Pet {
        ...
	@ManyToOne
	private Owner owner;
}
public class Owner {
        ...
}

public interface PetRepo extends JpaRepository<Pet, UUID> {

}
public interface OwnerRepo extends JpaRepository<Owner, UUID> {

}

The generated api doc for GET /pets/{id}

  /pets/{id}:
    get:
      tags:
      - pet-entity-controller
      description: get-pet
      operationId: getItemResource-pet-get
      parameters:
      - name: id
        in: path
        required: true
        schema:
          type: string
      responses:
        "200":
          description: OK
          content:
            application/hal+json:
              schema:
                $ref: '#/components/schemas/EntityModelPet'
        "404":
          description: Not Found
...
    EntityModelPet:
      type: object
      properties:
        id:
          type: string
          format: uuid
        name:
          type: string
        owner:
          $ref: '#/components/schemas/Owner'
        _links:
          $ref: '#/components/schemas/Links'

The owner property is not part of the response body of the GET call but it is a link in the _links section.

For the POST call, we get

    post:
      tags:
      - pet-entity-controller
      description: create-pet
      operationId: postCollectionResource-pet-post
      requestBody:
        content:
          application/json:
            schema:
              $ref: '#/components/schemas/Pet'
      responses:
        "201":
          description: Created
          content:
            application/hal+json:
              schema:
                $ref: '#/components/schemas/EntityModelPet'
...
    Pet:
      required:
      - name
      type: object
      properties:
        id:
          type: string
          format: uuid
        name:
          type: string
        owner:
          $ref: '#/components/schemas/Owner'

In this case, the owner property should be a String, not an Owner.

Expected behavior
In the GET-case, the model should not include any properties that are relations

In the POST-case the owner property should be a string, since the entity is references via href.

Current Workaround
I found a workaround by adding @Schema(implementation = String.class, accessMode = AccessMode.WRITE_ONLY) to the relation property in the data model as follows, but I think the springdoc should do it right out of the box.

public class Pet {
        ...
	@ManyToOne
        @Schema(implementation = String.class, accessMode = AccessMode.WRITE_ONLY)
	private Owner owner;
}