[9.3] Sort the values of a legacy histogram during downsampling (#140771)#140829
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elasticsearchmachine merged 1 commit intoelastic:9.3from Jan 16, 2026
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…0771) When indexing legacy histograms in elasticsearch we require that their values are sorted. When downsampling is using the aggregate method, it merges the histograms to a single one and indexes it in the target index. We noticed that some merging algorithms do not guarantee that the centroids will be sorted. This PR adds code that sorts the centroids before they are indexed to the target index to avoid indexing failures. Fixes elastic#139382
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Backports the following commits to 9.3: