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Docs: Add note about missing mapping for doc values field (#29036) 

This commit adds a documentation note about the behavior when trying to
access docvalues for a field which does not exist in mappings.

closes #22056
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Ryan Ernst 2018-03-20 22:15:34 -07:00 committed by GitHub
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commit 744777a6a0
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docs/reference/modules/scripting/fields.asciidoc
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@ -115,6 +115,17 @@ Doc-values can only return "simple" field values like numbers, dates, geo-
points, terms, etc, or arrays of these values if the field is multi-valued.
It cannot return JSON objects.
[NOTE]
.Missing fields
===================================================
The `doc['field']` will throw an error if `field` is missing from the mappings.
In `painless`, a check can first be done with `doc.containsKey('field')` to guard
accessing the `doc` map. Unfortunately, there is no way to check for the
existence of the field in mappings in an `expression` script.
===================================================
[NOTE]
.Doc values and `text` fields
===================================================