Cause
the specified index already exists in the dictionary
the specified index already exists in the dictionary
this index can be updated or deleted, however this is only allowed if there is no text index available on the text column
Try the following links for this error:
http://docs.oracle.com/cd/E16655_01/server.121/e26079/drgus.htm
https://community.oracle.com/message/10866019
https://community.oracle.com/message/11023286
https://community.oracle.com/message/2421579
https://community.oracle.com/message/3778854
https://community.oracle.com/message/2228391
https://community.oracle.com/message/1297115
https://community.oracle.com/message/510603
https://community.oracle.com/message/3233309
https://community.oracle.com/message/1167413
https://community.oracle.com/message/9582834
https://community.oracle.com/message/3778863
https://community.oracle.com/message/1886914
https://community.oracle.com/message/1168533
https://community.oracle.com/message/9599812
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