+ * @param replicatedLogEntry the entry to append
+ * @param callback the Procedure to be notified when persistence is complete (optional).
+ * @param doAsync if true, the persistent actor can receive subsequent messages to process in between the persist
+ * call and the execution of the associated callback. If false, subsequent messages are stashed and get
+ * delivered after persistence is complete and the associated callback is executed.
+ * @return true if the entry was successfully appended, false otherwise.