code: func (s *specAggregator) tryDeleteServiceSpecs(apiServiceName string) error {
  	orgSpecInfo, exists := s.openAPISpecs[apiServiceName]
  	if !exists {
  		return nil
  	}
  	delete(s.openAPISpecs, apiServiceName)
  	if err := s.updateOpenAPISpec(); err != nil {
  		s.openAPISpecs[apiServiceName] = orgSpecInfo
  		return err
  	}
  	return nil
  }
docs: // tryDeleteServiceSpecs tries delete specified specInfo from openAPISpecs map, and keeps the map intact
  // if the update fails.