I wonder whether it was possible or not to have date histogram aggregation
be DST aware. From what I understand of the date histogram algorithm, it's
something like :
date + offset - (date + offset) % interval
Maybe a scripted term aggregation would be a better solution if the date
datas already have a DST aware offset registered.
For example, let's say we have documents with those kind of date fields :
Using string manipulation in scripted term aggregation to retrieve document
by day would be trivial but less performant than date_histogram aggregation
which would probably not be able to aggregate dates taking DST into account.
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