s1monw opened a new pull request #1397: LUCENE-9304: Refactor DWPTPool to pool DWPT directly URL: https://github.com/apache/lucene-solr/pull/1397 This change removes the `ThreadState` indirection from DWPTPool and pools DWPT directly. The tracking information and locking semantics are mostly moved to DWPT directly and the pool semantics have changed slightly such that DWPT need to be _checked-out_ in the pool once they need to be flushed or aborted. This automatically grows and shrinks the number of DWPT in the system when number of threads grow or shrink. Access of pooled DWPTs is more straight forward and doesn't require ordinal. Instead consumers can just iterate over the elements in the pool. This allowed for removal of indirections in DWPTFlushControl like `BlockedFlush`, the removal of DWPTPool setter and getter in `IndexWriterConfig` and the addition of stronger assertions in DWPT and DW.
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