Kafka Admin Client `close` does not report completion

[cescoffier]

 @Override
  public Future<Void> close(long timeout) {
    ContextInternal ctx = (ContextInternal) vertx.getOrCreateContext();
    Promise<Void> promise = ctx.promise();

    ctx.executeBlocking(prom -> {
      if (timeout > 0) {
        adminClient.close(Duration.ofMillis(timeout));
      } else {
        adminClient.close();
      }
      prom.complete();
    });
    return promise.future();
  }

The executeBlocking to not report the completion on the right promise.

[cescoffier]

This is blocking the integration of Vert.x 4 in SmallRye Reactive Messaging and so Quarkus.

[cescoffier]

Also, it needs to handle failure (as close may fail in some rare situations).