public String kind() {
        return this.kind;
    }
@return Kind of object being referenced. Values defined by this API group are &#34;User&#34;, &#34;Group&#34;, and &#34;ServiceAccount&#34;. If the Authorizer does not recognized the kind value, the Authorizer should report an error.
sdk/java/src/main/java/com/pulumi/kubernetes/rbac/v1/outputs/Subject.java