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

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Merged
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Mar 21, 2018
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Docs: Add note about missing mapping for doc values field #29036

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Docs: Add note about missing mapping for doc values field
rjernst Mar 13, 2018
03eb09d
Merge branch 'master' into docs_script_docvalues
rjernst Mar 20, 2018
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11 changes: 11 additions & 0 deletions docs/reference/modules/scripting/fields.asciidoc
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Expand Up @@ -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
===================================================
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