<li class="col-sm-12">
                                                    <h3 class="title">
                                                        <a href="${doc.url_link}">${doc.content_title}</a>
                                                    </h3>
                                                    <div class="body col-sm-10">

                        timestamp:
                          type: string
                          format: date-time
                          example: "2017-10-09T22:28:56.000Z"
                        url_link:
                          type: string
                          example: "https://fess.codelibs.org/"
                        created:
                          type: string
                          format: date-time