Allow null 'format' in DateRangeAggregation#351

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pmishev wants to merge 1 commit intoongr-io:7.1from pmishev:7.1-daterangeaggregation-fix

+6-5

Commits on Mar 11, 2021

Allow null 'format' in DateRangeAggregation, as it is not required
pmishev
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