I got this error message "DRG-10599: column is not indexed ", I tried to solve it using Content Server Zone Field Configuration but I failed. Where The problem was from dDocFulltext field in IdcColl1 & IdcColl2 tables.
I solved it by indexing that field directly on the database, using this query
CREATE INDEX idxDDOCFULLTEXT1 ON STELLENT.IDCCOLL1(DDOCFULLTEXT) INDEXTYPE IS CTXSYS.CONTEXT PARAMETERS ('SYNC (ON COMMIT)')
CREATE INDEX idxDDOCFULLTEXT2 ON STELLENT.IDCCOLL2(DDOCFULLTEXT) INDEXTYPE IS CTXSYS.CONTEXT PARAMETERS ('SYNC (ON COMMIT)')
If you have the same problem with dDocFullText use that query, but If you have it with other fields use Zone Field Configuration