zhangchao.es created LUCENE-9601:
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             Summary: Why not use HardLink in indexWriter.addIndexes
                 Key: LUCENE-9601
                 URL: https://issues.apache.org/jira/browse/LUCENE-9601
             Project: Lucene - Core
          Issue Type: New Feature
          Components: core/index
    Affects Versions: 8.6.3
            Reporter: zhangchao.es


when we addIndexes from dirs,it use copySegmentAsIs to copy segment files to 
dest dir,that 

requires 2x temporary free space and more io operations.Can hard links be used 
instead of copying files?



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