ORA-01502: index 'string.string' or partition of such index is in unusable state

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ORA-01502: index 'string.string' or partition of such index is in unusable state
Cause: An attempt has been made to access an index or index partition that has
been marked unusable by a direct load or by a DDL operation
Action: DROP the specified index, or REBUILD the specified index, or REBUILD
the unusable index partition