1. Activate the search module setting in main/admin/settings.php?category=Search
2. Go to main/admin/specific_fields.php and Specific fields (Those are text fields that will be add in documents, exercises, links in order to index data)
i.e i.e. Author, Body part, Technology, Topic
3. Go to main/admin/settings.php?category=Search and set a Specific field by default