There are several token filters available which try to normalize special characters of a certain language.
Arabic
arabic_normalization
German
german_normalization
Hindi
hindi_normalization
Indic
indic_normalization
Kurdish (Sorani)
sorani_normalization
Persian
persian_normalization
Scandinavian
scandinavian_normalization, scandinavian_folding
scandinavian_normalization
scandinavian_folding
Serbian
serbian_normalization
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