28d4685d72
Date histograms on non-fixed timezones such as `Europe/Paris` proved much slower than histograms on fixed timezones in #28727. This change mitigates the issue by using a fixed time zone instead when shard data doesn't cross a transition so that all timestamps share the same fixed offset. This should be a common case with daily indices. NOTE: Rewriting the aggregation doesn't work since the timezone is then also used on the coordinating node to create empty buckets, which might be out of the range of data that exists on the shard. NOTE: In order to be able to get a shard context in the tests, I reused code from the base query test case by creating a new parent test case for both queries and aggregations: `AbstractBuilderTestCase`. Mitigates #28727 |
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