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[DOCS] copy_to only works one level deep, not recursively #37249

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Jan 13, 2019
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[DOCS] copy_to only works one level deep, not recursively #37249

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4 changes: 4 additions & 0 deletions docs/reference/mapping/params/copy-to.asciidoc
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Expand Up @@ -61,3 +61,7 @@ Some important points:
* It is the field _value_ which is copied, not the terms (which result from the analysis process).
* The original <<mapping-source-field,`_source`>> field will not be modified to show the copied values.
* The same value can be copied to multiple fields, with `"copy_to": [ "field_1", "field_2" ]`
* You cannot copy recursively via intermediary fields such as a `copy_to` on
`field_1` to `field_2` and `copy_to` on `field_2` to `field_3` expecting
indexing into `field_1` will eventuate in `field_3`, instead use copy_to
directly to multiple fields from the originating field.