public Optional<IngressBackendPatch> backend() {
        return Optional.ofNullable(this.backend);
    }
@return A default backend capable of servicing requests that don&#39;t match any rule. At least one of &#39;backend&#39; or &#39;rules&#39; must be specified. This field is optional to allow the loadbalancer controller or defaulting logic to specify a global default.
sdk/java/src/main/java/com/pulumi/kubernetes/extensions/v1beta1/outputs/IngressSpecPatch.java