@Override protected void doStart() throws ElasticSearchException {
this.serverOpenChannels = new OpenChannelsHandler();
if (blockingServer) {
serverBootstrap = new ServerBootstrap(new OioServerSocketChannelFactory(
Executors.newCachedThreadPool(daemonThreadFactory(settings, "memcached_server_boss")),
Executors.newCachedThreadPool(daemonThreadFactory(settings, "memcached_server_worker"))
));
} else {
serverBootstrap = new ServerBootstrap(new NioServerSocketChannelFactory(