index SomeIndex {
# .....
charset_type = utf-8
charset_table = 0..9, A..Z->a..z, _, a..z, U+410..U+42C->U+430..U+44C, U+42E..U+42F->U+44E..U+44F, U+430..U+44C, U+44E..U+44F, U+0401->U+0435, U+0451->U+0435, U+042D->U+0435, U+435, U+044D->U+0435
# .....
}