PostgreSQL full-text search SIMPLE dictionary template

Question

Hello, everyone!

I have a problem with simple full-text search dictionary template in Pg. It's simply passes through any non-English words not bothering lower-casing em. Is it by design or I miss some kind of setting here?

CREATE TEXT SEARCH DICTIONARY russian_simple (
    TEMPLATE = simple,
    StopWords = russian
);
SELECT ts_lexize('russian_simple', 'артём Тихомиров');

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ts_lexize
text[]
{"артём Тихомиров"}