code: function eachItem(callback) {
      function wrappedCallback(err, data) {
        if (err) return callback(err, null);
        if (data === null) return callback(null, null);
  
        var config = this.request.service.paginationConfig(this.request.operation);
        var resultKey = config.resultKey;
        if (Array.isArray(resultKey)) resultKey = resultKey[0];
        var results = AWS.util.jamespath.query(resultKey, data);
        AWS.util.arrayEach(results, function(result) {
          AWS.util.arrayEach(result, function(item) { callback(null, item); });
        });
      }
  
      this.eachPage(wrappedCallback);
    }
docs: Enumerates over individual items of a request, paging the responses if
  necessary.
  
  @api experimental
  @since v1.4.0