An optional channelId to limit results to entities assigned to the given Channel. Should
only be used when getting entities that implement the ChannelAware interface.
If set to a positive integer, it will retry getting the entity in case it is initially not
found. This can be useful when working with the EventBus and subscribing to the
creation of new Entities which may on first attempt be inaccessible due to an ongoing
Specifies the delay in ms to wait between retries.