code: def overview():
      
      search = Service.search()
      search = search.filter("term", state='open')
      search.aggs.bucket('port_count', 'terms', field='port', order={'_count': 'desc'}, size=100) \
          .metric('unique_count', 'cardinality', field='address')
      response = search.execute()
      print_line("Port     Count")
      print_line("---------------")
      for entry in response.aggregations.port_count.buckets:
          print_line("{0:<7}  {1}".format(entry.key, entry.unique_count.value))
docs: Function to create an overview of the services.
          Will print a list of ports found an the number of times the port was seen.