Clarify that the `null_value` option doesn't modify the `_source` document. (#28374)
Closes #15959
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@ -50,3 +50,6 @@ GET my_index/_search
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IMPORTANT: The `null_value` needs to be the same datatype as the field. For
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instance, a `long` field cannot have a string `null_value`.
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NOTE: The `null_value` only influences how data is indexed, it doesn't modify
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the `_source` document.
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