Syntax: list of field(s) from select boxes, any order
These fields will be indexed along with Index Fields, but in the compound portion of the main search index. They are not searched by the text query, but are used to improve accuracy and performance for certain ancillary queries performed in addition to the main text search, such as when ordering results by date, or searching by depth. The default values are Visited, Modified, Depth and Pop.
The selected fields may be in any order; they are used only when needed, unlike Index Fields, all of which are always searched by the user's text query. Note the following caveats:
Note that as this is the same overall index as Index Fields, changing any of these fields will cause indexes to be rebuilt, which may take several minutes or more for large-data profiles. The old setting(s) will be used until the index rebuild is complete.