code: def _find_service_name(self):
          
          space = predix.admin.cf.spaces.Space()
          services = space.get_services()
          for service in services:
              if service.startswith('logstash'):
                  return service
  
          return 'logstash-3'
docs: For cloud operations there is support for multiple pools of resources
          dedicated to logstash.  The service name as a result follows the
          pattern logstash-{n} where n is some number.  We can find it from the
          service marketplace.