code: def get_index(self, name):
          
          name = self._normalize_identifier(name)
          if not self.has_index(name):
              raise IndexDoesNotExist(name, self._name)
  
          return self._indexes[name]
docs: Returns the Index with the given name.
  
          :param name: The index name
          :type name: str
  
          :rtype: Index