IPTSPlumtreeCollection.CategorizableObjectType. For the portal's "folder" categorization, use field IPTSPortalCollection.FolderPath. Any other searchable and retrievable string field may also be used for clustering. In this case, the search server will find the most common terms (words) in the field (within your set of search results). Each group will correspond to one of these common terms, and will contain search results that have the term in the field. Note that a single search result may appear in multiple groups. For a simple example, suppose that the Name field is used, and documents "Cats Dogs" and "Cats Mice" match the query. The first group will be "Cats" and contain both results. "Dogs" and "Mice" will be the other group, and will each contain one result. IPTSQueryRequest Interface | com.plumtree.server.search Namespace | IPTSQueryRequest.setResultsGroupBy Overload List