CustomFacet - Displays the facets to refine the search results using user chosen behavior
Facets to show (comma separated list of facet ids). Default is an empty array.
Facets to hide (comma separated list of facet ids). Default is an empty array.
Name of the function (that must be defined in the page context) to call to display the selected facets.
It is called for each facet selected by the include / exclude rules.