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[Guide to use stemming with a synonym list in ES](https://www.elastic.co/de/blog/improve-search-relevance-by-combining-elasticsearch-stemmers-and-synonyms)
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Since we face multilingual documents, stemming can be implemented after the language of different fields and the language of the search is known.
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Or use Snowball stemmer to consider various languages: *Arabic, Armenian, Basque, Catalan, Danish, Dutch, English, Estonian, Finnish, French, German, German2, Hungarian, Italian, Irish, Kp, Lithuanian, Lovins, Norwegian, Porter, Portuguese, Romanian, Russian, Spanish, Swedish, Turkish*.
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