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[docs] add 2d vis for decay functions and parameters 

closes #8420
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Britta Weber 2014-11-10 10:50:11 +01:00
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docs/reference/images/decay_2d.png Normal file
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docs/reference/query-dsl/queries/function-score-query.asciidoc
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@ -308,6 +308,10 @@ In contrast to the normal and exponential decay, this function actually
sets the score to 0 if the field value exceeds twice the user given sets the score to 0 if the field value exceeds twice the user given
scale value. scale value.
For single functions the three decay functions together with their parameters can be visualized like this (the field in this example called "age"):
image:images/decay_2d.png[width=600]
===== Multiple values: ===== Multiple values:
If a field used for computing the decay contains multiple values, per default the value closest to the origin is chosen for determining the distance. If a field used for computing the decay contains multiple values, per default the value closest to the origin is chosen for determining the distance.