[8.x] Optimize ES819 doc values address offset calculation (#126732)#127079
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elasticsearchmachine merged 1 commit intoelastic:8.xfrom Apr 18, 2025
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When writing the doc values addresses, we currently perform an iteration over all the sorted numeric doc values to calculate the addresses. When merging sorted segments, this iteration is expensive as it requires performing a merge sort. This patch removes this iteration by instead calculating the addresses while we are writing the values, writing the addresses to a temporary file. Afterwards, they are copied from the temporary file into the merged segment. Relates to elastic#126111
jordan-powers
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:StorageEngine/Codec
>non-issue
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Backports the following commits to 8.x: