[9.3] Partition time-series source (#140475)#141086
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dnhatn merged 1 commit intoelastic:9.3from Jan 22, 2026
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Today, for rate aggregations, we can't partition a target shard by DOC or SEGMENT, only by SHARD. Because of this, we rely on ROUND_TO from time_bucket to partition the target shard into multiple slices. However, the number of slices can be either too many or too few. Too few large slices might under-utilize the CPUs and require a large amount of memory to buffer data points. Many smaller slices solve these issues but add significant overhead. This change replaces the ROUND_TO partitioning with time-based partitioning for time-series sources. One potential overhead of this method compared to ROUND_TO is that, with ROUND_TO, we do not need to perform round_to for the timestamp, as the query source provides this constant. (cherry picked from commit 54ee110) # Conflicts: # x-pack/plugin/esql/qa/testFixtures/src/main/resources/k8s-timeseries.csv-spec # x-pack/plugin/esql/src/main/java/org/elasticsearch/xpack/esql/action/EsqlCapabilities.java
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