Remove deleted occurrences from the Smart Discovery index

When a user removes an occurrence from a structure, the occurrence continues to appear as a facet on the Filter panel, by default. This is because the value of the QSEARCH_index_deletion_mode site preference is set to disabled, due to which the occurrence continues to be available in the Smart Discovery index. If you do not want the deleted occurrences to appear as facets, you must change the value of this preference to delete. On doing so, any occurrence that the user deletes in the future is removed from the Smart Discovery index when the index is updated. Occurrences that were deleted from the structure before you changed the value of the preference to delete are not removed from the Smart Discovery index.