Version: 5.2.2

I'm currently sorting by dynamic fields and a timestamp and want to utilize the search_after property.  Unfortunately, for certain fields that are missing the dynamic field, they return "Infinity" or "-Infinity" in the sort property result set.  When passing back those Infinity values in any position (either as a String or as a really high Number), ES seems to just return the first page of results again.

[Example sort against docs that don't have the dynamic field.](http://imgur.com/a/s8UUO)

Has anyone had to overcome this before?

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