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Add warnings to similarities that may return 0 as a score. #29015

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jpountz opened this issue Mar 13, 2018 · 2 comments
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Add warnings to similarities that may return 0 as a score. #29015

jpountz opened this issue Mar 13, 2018 · 2 comments
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>docs General docs changes help wanted adoptme :Search/Search Search-related issues that do not fall into other categories

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@jpountz
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jpountz commented Mar 13, 2018

Some similarities may return scores that are equal to zero in some conditions. We should probably add warnings to the docs about such similarities as this is usually impractical in practice since having matches on terms that contribute 0 to the score doesn't make such documents rank higher as is usually expected.

  • AxiomaticF3Log
  • AxiomaticF3Exp
  • DFISimilarity
  • LMDirichletSimilarity
@jpountz jpountz added >docs General docs changes help wanted adoptme :Search/Search Search-related issues that do not fall into other categories labels Mar 13, 2018
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Pinging @elastic/es-search-aggs

@jpountz jpountz mentioned this issue Mar 13, 2018
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jpountz added a commit to jpountz/elasticsearch that referenced this issue Mar 15, 2018
@jpountz
Improve similarity docs.
174fd84 
This adds links to the relevant Lucene javadocs and warnings regarding
similarities that might return 0 as a score.

Close elastic#29015
@jpountz jpountz mentioned this issue Mar 15, 2018
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@jpountz
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jpountz commented Mar 15, 2018

Actually the axiomatic similarities are not exposed.

jpountz added a commit that referenced this issue Mar 21, 2018
@jpountz
Improve similarity docs. (#29089)
1d6ed82 
This adds links to the relevant Lucene javadocs and warnings regarding
similarities that might return 0 as a score.

Close #29015
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