code: private void doUndeployNetwork(final Message<JsonObject> message) {
      Object network = message.body().getValue("network");
      if (network != null) {
        // When undeploying a network from the cluster, we first determine
        // the node to which the network belongs by selecting a node.
        // The node that is selected for the network is always the node
        // that controls the network.
        String key;
        if (network instanceof String) {
          key = (String) network;
        } else if (network instanceof JsonObject) {
          try {
            key = serializer.deserializeObject((JsonObject) network, NetworkConfig.class).getName();
          } catch (SerializationException e) {
            message.reply(new JsonObject().putString("status", "error").putString("message", e.getMessage()));
            return;
          }
        } else {
          message.reply(new JsonObject().putString("status", "error").putString("message", "Invalid network configuration."));
          return;
        }
  
        selectNode(key, new Handler<AsyncResult<String>>() {
          @Override
          public void handle(AsyncResult<String> result) {
            if (result.failed()) {
              message.reply(new JsonObject().putString("status", "error").putString("message", result.cause().getMessage()));
            } else if (result.result() == null) {
              message.reply(new JsonObject().putString("status", "error").putString("message", "No nodes available."));
            } else {
              vertx.eventBus().sendWithTimeout(result.result(), message.body(), 120000, new Handler<AsyncResult<Message<JsonObject>>>() {
                @Override
                public void handle(AsyncResult<Message<JsonObject>> result) {
                  if (result.failed()) {
                    message.reply(new JsonObject().putString("status", "error").putString("message", "Failed to reach node."));
                  } else {
                    message.reply(result.result().body());
                  }
                }
              });
            }
          }
        });
      } else {
        message.reply(new JsonObject().putString("status", "error").putString("message", "No network specified."));
      }
    }
docs: Undeploys a network.