public void When(EventStoreIndexRequested e)
 {
     Id = e.Id;
     LastVersionRequestTimebox = e.Timebox;
     IsBuilding = true;
 }
        private void BuildIndex(EventStoreIndexManagerId id, VersionRequestTimebox timebox)
        {
            var @event = new EventStoreIndexRequested(id, DateTimeOffset.UtcNow, timebox);

            Apply(@event);
        }