public Optional<String> getStartupCommand() {
        return Optional.of("exec $ROOT/sbin/vespa-slobrok -N -p " + getRpcPort() + " -c " + getConfigId());
    }
@param parent the parent ConfigProducer.
@param index  unique index for all slobroks
config-model/src/main/java/com/yahoo/vespa/model/admin/Slobrok.java