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docs: remove null from expressions case.

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Expressions don't have nulls, only doubles. If the field is missing, then its
treated as 0.0. You can query .empty to see if its missing and substitute something else.

See https://github.com/elastic/elasticsearch/pull/18132#discussion_r62068494
This commit is contained in:
Robert Muir 2016-05-04 12:49:16 -04:00
parent 4c6cf7ee88
commit 7656d7ea73
1 changed files with 2 additions and 2 deletions
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docs/reference/modules/scripting/expression.asciidoc
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@ -99,9 +99,9 @@ The following example shows the difference in years between the `date` fields da
|`doc['field_name'].empty` |A boolean indicating if the field has no
values within the doc.
|`doc['field_name'].lat` |The latitude of the geo point, or `null`.
|`doc['field_name'].lat` |The latitude of the geo point.
|`doc['field_name'].lon` |The longitude of the geo point, or `null`.
|`doc['field_name'].lon` |The longitude of the geo point.
|=======================================================================
The following example computes distance in kilometers from Washington, DC: