[9.1] Aggs: Add cancellation checks to FilterByFilter aggregator (#130452) #130736
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…30452) By default, the `FilterByFilterAggregator` (Used by the `"filter"` and `"filters"` aggs) was using the `DefaultBulkScorer` (From Lucene), which has no cancellation mechanism. This PR wraps it into a `CancellableBulkScorer`, which instead calls the inner scorer with ranges, and checks cancellation between them. This should solve cases of long-running tasks using these aggregators not being cancelled, or greatly reduce the time they take after cancellation.
ivancea
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:Analytics/Aggregations
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Backports the following commits to 9.1: