code: public void setInitiator(Map<String, Object> initiator) {
          removeEntriesStartingWith(INITIATOR);
          eventMap.putAll(initiator);
      }
docs: Set the initiator keys/values. The provided Map will completely replace
  the existing initiator, i.e. all current initiator keys/values will be
  removed and the new initiator keys/values will be added.
  
  @param initiator - Map of all the initiator keys/values