Fix InternalAutoDateHistogramTests (backport of #54602) #54688
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The test had errors around time units that have different length - think leap years or months that aren't 30 days. This fixes those errors. In the proces I've changed a bunch of things to debug the problem: * Replace `currentTimeMillis` with a random time. Now the test fails randomly! Wonderful. Much better than on random days of the month. * Generate buckets "closer together" to test random reduction. Without this we were super frequently getting stuck in the "year of century" rounding because *some* of the of the buckets we built were far apart. This generates a much greater variety of tests. * Implement `toString` on `RoundingInfo` so I can debug without going crazy. * Switch keys in the bucket assertions from epoch millis to `Instant`s so we can read the failures. Closes elastic#54540 Closes elastic#39497
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The test had errors around time units that have different length - think
leap years or months that aren't 30 days. This fixes those errors. In
the proces I've changed a bunch of things to debug the problem:
currentTimeMilliswith a random time. Now the test failsrandomly! Wonderful. Much better than on random days of the month.
this we were super frequently getting stuck in the "year of century"
rounding because some of the of the buckets we built were far apart.
This generates a much greater variety of tests.
toStringonRoundingInfoso I can debug without goingcrazy.
Instantsso we can read the failures.
Closes #54540
Closes #39497