Add polish stemmer proposal #2746
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feat(tokenizer): add support for Polish language stemming - Introduced Tantivy stemmer algorithm for Polish language alongside Rust stemmers within Language enum and stemmer logic. - Added stemmer implementation and integration for Polish. - Expanded the stop-word filter to include a list of Polish stop words. - Updated tests to validate Polish tokenizer behavior. - Included the `tantivy-stemmers` dependency to support Polish language stemming. Polish language support enhances language coverage for text processing. ``` # Conflicts: # Cargo.lock
- Eliminated an unused import for Polish language in stemmer.rs. - Cleaned up redundant code to improve maintainability.
- Applied consistent formatting to `StemmerAlgorithm` and `token_stream`. - Simplified match expressions for better readability and maintainability. - Removed unnecessary blank lines in tokenizer tests. These changes enhance code clarity and maintain coding style consistency.
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What
This commit adds support for Polish language stemming.
Why
The previously used rust-stemmers crate is abandoned and unmaintained, which blocked the addition of new languages. This change addresses a user request for Polish stemming to improve BM25 recall in their use case. The tantivy-stemmers crate is a modern, maintained alternative that also opens the door for supporting many other languages in the future.
How
Tests