code: function (key) {
        if (key === undefined) {
          that.push({
            key: 'DOCUMENT' + sep + docId + sep,
            lastPass: true
          })
          return end()
        }
        that.options.indexes.get(key, function (err, val) {
          if (!err) {
            that.push({
              key: key,
              value: val
            })
          }
          pushValue(docFields[i++])
        })
      }
docs: get value from db and push it to the stream