Fix a sneaky bug in rare_terms (backport of #51868) #51959
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When the `rare_terms` aggregation contained another aggregation it'd break them. Most of the time. This happened because the process that it uses to remove buckets that turn out not to be rare was incorrectly merging results from multiple leaves. This'd cause array index out of bounds issues. We didn't catch it in the test because the issue doesn't happen on the very first bucket. And the tests generated data in such a way that the first bucket always contained the rare terms. Randomizing the order of the generated data fixed the test so it caught the issue. Closes elastic#51020
nik9000
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When the
rare_termsaggregation contained another aggregation it'dbreak them. Most of the time. This happened because the process that it
uses to remove buckets that turn out not to be rare was incorrectly
merging results from multiple leaves. This'd cause array index out of
bounds issues. We didn't catch it in the test because the issue doesn't
happen on the very first bucket. And the tests generated data in such a
way that the first bucket always contained the rare terms. Randomizing
the order of the generated data fixed the test so it caught the issue.
Closes #51020