How to Index Structured Information in SharePoint Sources
Two elements are required in order to index the structured information contained in SharePoint: a SharePoint or custom field (to indicate how CES should sort the information) and a reference (to indicate where CES should search for the information).
Note: For a list of all SharePoint fields built into CES, see Available System Fields. To create a custom field to index structured information not extracted by SharePoint fields, see How to Add New Properties to SharePoint References. Finally, to create a new reference or modify an existing one, see How to Add and Modify SharePoint References.