default OptionalInt destinationBrokerId() {
        return OptionalInt.empty();
    }
Get the target broker ID that a request is intended for or
empty if the request can be sent to any broker.

Note that if the destination broker ID is present in the
{@link ApiRequestScope} returned by {@link AdminApiLookupStrategy#lookupScope(Object)},
then no lookup will be attempted.

@return optional broker ID
clients/src/main/java/org/apache/kafka/clients/admin/internals/ApiRequestScope.java