alter_index_statement ::=  ALTER INDEX [ index_name ]
                                ON table_name index_state

ALTER INDEX idx1 ON test DISABLE;
ALTER INDEX idx1 ON test REBUILD;
ALTER INDEX idx1 ON test UNUSABLE;
ALTER INDEX idx1 ON test USABLE;
ALTER INDEX idx1 ON test DISABLED;
ALTER INDEX idx1 ON test ACTIVE;
ALTER INDEX idx1 ON test BUILDING;