[8.8] [ML] fix possible race condition in frequent item sets aggregation (#95860)#95879
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elasticsearchmachine merged 1 commit intoelastic:8.8from May 5, 2023
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…lastic#95860) Refactorings done in elastic#94023. improved memory management but also made it possible to run into a race condition in DelegatingCircuitBreaker. This change makes DelegatingCircuitBreaker thread-safe. This change is a quick-fix with low risk. Eventually DelegatingCircuitBreaker should be removed. Work on that is underway: elastic#89437. Under that circumstances the change is reasonable to me. The added locking overhead shouldn't be a problem, re-allocations happen rarely and there is just the disconnect case where 2 threads potentially access the structure at the same time. fixes elastic#95681
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Backports the following commits to 8.8: