Elasticsearch version 8.13.2edit
Also see Breaking changes in 8.13.
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Searches involving nodes upgraded to 8.13.0 and a coordinator node that is running on version
8.12 or earlier can produce duplicate buckets when running
date_histogram
orhistogram
aggregations. This can happen during a rolling upgrade to 8.13 or while running cross-cluster searches. (issue: #108181).