PrincipalGroupRelation is defined as Relation in core-items.xml and linked to bean "PrincipalGroupRelation" mapped to deployment table "PGRels". I am familiar of indexing item types (refer EnumeratonValue itemtype in core-items.xml ). Is there any way to index the fields [languagepk], [Qualifier], [SourcePK] in "PrincipalGroupRelation" relation type.