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

Closes #15959
Adrien Grand 7 years ago
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1 changed files with 3 additions and 0 deletions
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  1. 3 0
      docs/reference/mapping/params/null-value.asciidoc

+ 3 - 0
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
 
 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.