This addon is deprecated since Nuxeo Platform LTS 2016.
JSF UI Deprecation
This requires to have the JSF UI addon installed on your server that is deprecated since Nuxeo Platform LTS 2019. Please refer to the Web UI documentation.
The Smart Search package is a query engine that adds a new search form in the application from which you can build your queries and save them in smart folders. It offers search criteria on content, dates, and metadata.