next (focus) {
    if (this.results) {
      let index = this.resultIndex !== null ? this.resultIndex + 1 : 0
      if (index > this.results.length - 1) {
        index = 0
      }
      this._setActiveResult(index, focus)
    }
  }
Go to the next search result
@param {boolean} [focus]   If true, focus will be set to the next result
                           focus is false by default.