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AUD-00809:

ORDSpeechIndex: unable to ALTER REBUILD internal Text index
Cause: ALTER INDEX REBUILD for ORDSpeechIndex failed when trying to alter rebuild internal Text index.
Action: Make sure that you are supplying a valid parameter string. See SpeechIndexing and Oracle Text documentation for descriptions of a valid parameter string for ALTER INDEX REBUILD. To return to a consistent state, issue a ALTER INDEX REBUILD PARAMETERS('optimize full') command.