There is a service Yandex.Sitesearch (http://site.yandex.ru). This is a service that allows you to create search on the site or group of sites. For this service it is necessary that the site has been indexed by Yandex. Robots Yandex self-index the site. However, apart from the core of the index when searching the site uses an additional index, specially built for such sites. You can increase the priority of indexing certain pages of the site with the help of the plug-in Yandex.Sitesearch Pinger, which sends requests to the indexing automatically. This plug-in installed in a CMS, monitors changes to the site and generates requests for indexing all new or modified documents.
Basic information on what the plugin-pinger is described on page http://help.yandex.ru/site/?id=1125183. How to configure the plugin for Joomla! is described here http://help.yandex.ru/site/?id=1125171. Files of plugins and the basic information for the user is located here: http://site.yandex.ru/cms-plugins/