code: def _split_index(params):
      
      result = {}
      for key in params:
          if isinstance(params[key], dict):
              value = params[key]['_value']
          else:
              value = params[key]
          result[key] = value
      return result
docs: Delete index information from params
  
      Parameters
      ----------
      params : dict
  
      Returns
      -------
      result : dict