The Index Fields page displays a read-only list of all the index fields for your site. To display the list, click Index Fields on the Search tab. The list provides the following information for each index field:
Searchable
If this field is selected, shoppers can search on values entered for this property.
Facet
If this field is selected shoppers can use this property as a refinement when filtering search results.
Multi-select
If this field is selected, shoppers can use this property as a refinement and make multiple selections to filter search results. For example, shoppers could filter results by selecting several colors.