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Adjust DWPT pool concurrency to the number of cores. (#12216)
After upgrading Elasticsearch to a recent Lucene snapshot, we observed a few indexing slowdowns when indexing with low numbers of cores. This appears to be due to the fact that we lost too much of the bias towards larger DWPTs in #12199. This change tries to add back more ordering by adjusting the concurrency of `DWPTPool` to the number of cores that are available on the local node.
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