decide what grouping includes which results. These rules directly effect how the  search results are presented to users and therefore they influence how easy or  difficult it is for users to navigate through a result set especially if it is a large one. The enterprise search application uses these tuning rules to add additional  search query information and display relevant search results. Custom  applications can use API to get and configure this information based on the  application design. Factors influencing the sorting order of a search result set include boost factor for  a field, for a URI pattern, document importance setting, document ranking filter,  query expansion rules, and aggregate rules. Each document field can be configured to add a relative boost factor. This affects  the search result that is based on these fields being matched. To set the boost factor of a specific field: Figure 12-13 on page 464 shows the window where you edit an index field  setting.  Chapter 12. Enterprise search  463 Configuring the boost factor for fields 1. In the Parse and Index pane of the administration console, choose the  Pencil icon. 2. Select  Index Fields  and click the  Pencil  icon for the relevant field.  3. Select the  Fielded Search  check box and set the boost factor. 