Send the command to the PersistentEntity.
Send the command to the PersistentEntity. The returned
Future will be completed with the reply from the PersistentEntity.
The type of the reply is defined by the command (see PersistentEntity.ReplyType).
The Future may also be completed with failure, sent by the PersistentEntity
or a akka.pattern.AskTimeoutException if there is no reply within a timeout.
The timeout can defined in configuration or overridden using #withAskTimeout.
The timeout for #ask.
The timeout for #ask. The timeout is by default defined in configuration
but it can be adjusted for a specific PersistentEntityRef using this method.
Note that this returns a new PersistentEntityRef instance with the given timeout
(PersistentEntityRef is immutable).
Commands are sent to a PersistentEntity using a
PersistentEntityRef. It is retrieved with PersistentEntityRegistry#refFor.