Aleksandr Popitich created LUCENE-10156:
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Summary: BlendedInfixSuggester incorrectly scores items with high
and low weights
Key: LUCENE-10156
URL: https://issues.apache.org/jira/browse/LUCENE-10156
Project: Lucene - Core
Issue Type: Bug
Components: core/search
Affects Versions: 8.10
Reporter: Aleksandr Popitich
After LUCENE-8343 fix BlendedInfixSuggester applies additional 1 / LINEAR_COEF
coefficient for weight that fall to (-10, 10) range. Where LINEAR_COEF = 0.1
Link to the changes:
[Code|https://github.com/apache/lucene/commit/e0232f104509f28126d9ce060663f87508366338]
Whilst it fixes zero score issues, it causes incorrect scoring between item
with weight < 10 and item with weight > 10.
*Example:*
Blender - POSITION_RECIPROCAL (weight / (1 + position))
||Item||Weight||Score||
|AAA|8|8 * (1 / 0.1) * (1 / (1 + 0)) = 80|
|AAB|11|11 * (1 / (1 + 0)) = 11|
So item AAA with the same position, but with lower weight bubbled up, but in
fact if should be on bottom.
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