[9.3] Fix GPU merge ClassCastException with wrapped directories (#143531)#143924
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elasticsearchmachine merged 4 commits intoelastic:9.3from Mar 10, 2026
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…3531) MemorySegmentUtils directly cast the Directory to FSDirectory, but Elasticsearch wraps directories in Store$StoreDirectory (which extends FilterDirectory, not FSDirectory). When vector data exceeds MMapDirectory's max chunk size, the fallback path hit this cast and threw a ClassCastException, failing all shard merges. ClassCastException: Store$StoreDirectory cannot be cast to FSDirectory (Store$StoreDirectory is in module org.elasticsearch.server; FSDirectory is in module org.apache.lucene.core) Use FilterDirectory.unwrap() to peel through wrapper layers before casting. Also fix log message formatting for segment size values. Relates to elastic#141872
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Backports the following commits to 9.3: