/**
  * Unassign and return slot
  *
  * @param startMessageId start message id of slot
  * @param endMessageId end message id of slot
  * @throws AndesException
  */
 @Override
 public void deleteSlotAssignment(long startMessageId, long endMessageId) throws AndesException {
   try {
     wrappedAndesContextStoreInstance.deleteSlotAssignment(startMessageId, endMessageId);
   } catch (AndesStoreUnavailableException exception) {
     notifyFailures(exception);
     throw exception;
   }
 }