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Fix concurrency issues of the _parent field data. #9030
I am experiencing these exceptions when performing aggregations with has_child filters. But in the same queries the doc_count of the has_child filter returns random values, usually +/- 10% of the correct amount.
Disabling the filter cache greatly reduces the randomness, but not entirely.
Can I check that the randomness is likely caused by this bug and will be fixed in 1.4.3? This is pretty nasty for us as customers lose a lot of trust in our product when they see numbers changing randomly, and we have no way of detecting errors.