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Clarify that the `null_value` option doesn't modify the `_source` document. (#28374) 

Closes #15959
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Adrien Grand 2018-01-31 15:04:11 +01:00 committed by GitHub
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docs/reference/mapping/params/null-value.asciidoc
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@ -50,3 +50,6 @@ GET my_index/_search
IMPORTANT: The `null_value` needs to be the same datatype as the field. For IMPORTANT: The `null_value` needs to be the same datatype as the field. For
instance, a `long` field cannot have a string `null_value`. instance, a `long` field cannot have a string `null_value`.
NOTE: The `null_value` only influences how data is indexed, it doesn't modify
the `_source` document.