clear() {
    this.setInput('');

    this.elementsArray.forEach((element: HTMLElement) => {
      this._showElement(element);
    });

    if (this.options.placeholder) {
      this._hideElement(this.placeholderNode);
    }

    this.hidden = 0;
  }
Empty the search string programmatically.
This avoids having to send a new `input` event
@function clear
@memberOf holmes