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Add support for .empty to expressions, and some docs improvements

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Closes #18077
This commit is contained in:
Robert Muir 2016-05-02 09:07:25 -04:00
parent 9fee8c76af
commit 28409e4509
5 changed files with 145 additions and 11 deletions
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19
docs/reference/modules/scripting/scripting.asciidoc
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@ -455,11 +455,25 @@ for details on what operators and functions are available.
Variables in `expression` scripts are available to access:
* Single valued document fields, e.g. `doc['myfield'].value`
* Single valued document fields can also be accessed without `.value` e.g. `doc['myfield']`
* document fields, e.g. `doc['myfield'].value` or just `doc['myfield']`.
* whether the field is empty, e.g. `doc['myfield'].empty`
* Parameters passed into the script, e.g. `mymodifier`
* The current document's score, `_score` (only available when used in a `script_score`)
When a document is missing the field completely, by default the value will be treated as `0`.
You can treat it as another value instead, e.g. `doc['myfield'].empty ? 100 : doc['myfield'].value`
When a document has multiple values for the field, by default the minimum value is returned.
You can choose a different value instead, e.g. `doc['myfield'].sum()`. The following methods are available
for any field:
* min()
* max()
* avg()
* median()
* sum()
* count()
Variables in `expression` scripts that are of type `date` may use the following member methods:
* getYear()
@ -477,7 +491,6 @@ There are a few limitations relative to other script languages:
* Only numeric fields may be accessed
* Stored fields are not available
* If a field is sparse (only some documents contain a value), documents missing the field will have a value of `0`
[float]
=== Score