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The error message "Unique constraint violated" while creating a FullText Index in SAP HANA means that the index, which is responsible for efficient searching of terms within text fields, is attempting to create a duplicate entry where a unique constraint already exists. This can occur if the FullText Index is trying to index a value that already exists in the index, or if multiple values are being indexed that are identical in terms of the unique constraint. To resolve this error, it is necessary to adjust the indexing settings or identify and remove the duplicate values.