Stemming does not work for non-english locale

[lockie]

Description

Stemming does not seem to work for non-english locale (specifically, russian one). Search results on a big corpus of text are entirely different for the adjective "доверенное" and for the "доверенные" (same adjective, plural form). Snowball demo correctly recognizes the base form of those adjectives.

Steps to reproduce

mkdir data
export TYPESENSE_API_KEY='some-key'
export TYPESENSE_HOST='http://localhost:8108'
typesense-server --data-dir=$(pwd)/data&
curl "${TYPESENSE_HOST}/collections" \
      -X POST \
      -H "Content-Type: application/json" \
      -H "X-TYPESENSE-API-KEY: ${TYPESENSE_API_KEY}" -d '{
        "name": "posts",
        "enable_nested_fields": true,
        "fields": [
          {"name": "text", "type": "string", "locale": "ru", "stem": true }
        ]
      }'
curl "${TYPESENSE_HOST}/collections/posts/documents" \
        -X POST \
        -H "Content-Type: application/json" \
        -H "X-TYPESENSE-API-KEY: ${TYPESENSE_API_KEY}" \
        -d '{
          "text": "доверенное"
        }'
curl "${TYPESENSE_HOST}/collections/posts/documents" \
        -X POST \
        -H "Content-Type: application/json" \
        -H "X-TYPESENSE-API-KEY: ${TYPESENSE_API_KEY}" \
        -d '{
          "text": "доверенные"
        }'
curl -H "X-TYPESENSE-API-KEY: ${TYPESENSE_API_KEY}" \
     "${TYPESENSE_HOST}/collections/posts/documents/search?query_by=text&q=доверенное"

Expected Behavior

Both documents matched.

Actual Behavior

Only single document is matched:

{"facet_counts":[],"found":1,"hits":[{"document":{"id":"0","text":"доверенное"},"highlight":{"text":{"matched_tokens":["доверенное"],"snippet":"<mark>доверенное</mark>"}},"highlights":[{"field":"text","matched_tokens":["доверенное"],"snippet":"<mark>доверенное</mark>"}],"text_match":578730123365711993,"text_match_info":{"best_field_score":"1108091339008","best_field_weight":15,"fields_matched":1,"num_tokens_dropped":0,"score":"578730123365711993","tokens_matched":1,"typo_prefix_score":0}}],"out_of":2,"page":1,"request_params":{"collection_name":"posts","first_q":"доверенное","per_page":10,"q":"доверенное"},"search_cutoff":false,"search_time_ms":1}

Metadata

Typesense Version: 26.0

OS: Linux