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@@ -446,7 +446,7 @@ image::https://f.cloud.github.com/assets/4320215/768165/19d8b1aa-e899-11e2-91bc-
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Only single valued numeric fields, including time and geo locations,
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are supported.
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-==== What is a field is missing?
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+==== What if a field is missing?
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If the numeric field is missing in the document, the function will
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return 1.
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