Nik Everett 9a3d4db840
Begin moving date_histogram to offset rounding (backport of #50873) (#50978)
We added a new rounding in #50609 that handles offsets to the start and
end of the rounding so that we could support `offset` in the `composite`
aggregation. This starts moving `date_histogram` to that new offset.
2020-01-14 16:50:27 -05:00
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