Fix date_nanos in composite aggs (#53315) #53347
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It looks like `date_nanos` fields weren't likely to work properly in composite aggs because composites iterate field values using points and we weren't converting the points into milliseconds. Because the doc values were coming back in milliseconds we ended up geting very confused and just never collecting sub-aggregations. This fixes that by adding a method to `DateFieldMapper.Resolution` to `parsePointAsMillis` which is similarly in name and function to `NumberFieldMapper.NumberType`'s `parsePoint` except that it normalizes to milliseconds which is what aggs need at the moment. Closes elastic#53168
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It looks like
date_nanosfields weren't likely to work properly incomposite aggs because composites iterate field values using points and
we weren't converting the points into milliseconds. Because the doc
values were coming back in milliseconds we ended up geting very confused
and just never collecting sub-aggregations.
This fixes that by adding a method to
DateFieldMapper.ResolutiontoparsePointAsMilliswhich is similarly in name and function toNumberFieldMapper.NumberType'sparsePointexcept that it normalizesto milliseconds which is what aggs need at the moment.
Closes #53168