code: void onInstanceLost(String uniqueIdentifier) {
  		log(TAG, "instance lost " + uniqueIdentifier);
  		List<String> queriesIds = results.get(uniqueIdentifier);
  		if (queriesIds == null) {
  			return;
  		}
  		for (String queryId : queriesIds) {
  			String[] args = new String[2];
  			args[0] = queryId;
  			args[1] = uniqueIdentifier;
  			Message msg = handler.obtainMessage(SearchMessages.RESULT_LOST,
  					args);
  			log(TAG, "sending message RESULT_LOST to handler for queryId: "
  					+ queryId);
  			handler.sendMessage(msg);
  		}
  	}
docs: Call this method when the middleware notify that a spf instance is lost.
  It will notify the event to all the active searches that have the lost
  instance in their results.
  
  @param uniqueIdentifier
  the identifier of the lost instance