We should return the issue link id after creating an issue link via the REST API. This most likely does not only affect the issue link creation API endpoint, but also the one to retrieve an issue link. The listing endpoint is not affected, because it returns a different model. We should also: - Implement the specs accordingly - Adjust the documentation with the introduction of the new response field. This request came up in https://gitlab.com/gitlab-org/terraform-provider-gitlab/-/merge_requests/2840 and will avoid pagination through all pages to find the issue link that was just created.