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Docs: Clarify constraints on scripted similarities. #31076

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Jun 5, 2018
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Docs: Clarify constraints on scripted similarities. #31076

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Docs: Clarify constraints on scripted similarities.
jpountz Jun 4, 2018
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jpountz Jun 4, 2018
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14 changes: 12 additions & 2 deletions docs/reference/index-modules/similarity.asciidoc
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Expand Up @@ -341,7 +341,18 @@ Which yields:
// TESTRESPONSE[s/"took": 12/"took" : $body.took/]
// TESTRESPONSE[s/OzrdjxNtQGaqs4DmioFw9A/$body.hits.hits.0._node/]

You might have noticed that a significant part of the script depends on
WARNING: While scripted similarities provide a lot of flexibility, there is
a set of rules that they need to satisfy. Failing to do so could make
Elasticsearch silently return wrong top hits or fail with internal errors at
search time:

- Returned scores must be positive.
- All other variables remaining equal, scores must not decrease when
`doc.freq` increases.
- All other variables remaining equal, scores must not increase when
`doc.length` increases.

You might have noticed that a significant part of the above script depends on
statistics that are the same for every document. It is possible to make the
above slightly more efficient by providing an `weight_script` which will
compute the document-independent part of the score and will be available
Expand Down Expand Up @@ -506,7 +517,6 @@ GET /index/_search?explain=true

////////////////////


Type name: `scripted`

[float]
Expand Down