Rei Shapira created LUCENE-7843:
-----------------------------------

             Summary: DirectoryReader.listCommits handling of corrupt segments 
has broken
                 Key: LUCENE-7843
                 URL: https://issues.apache.org/jira/browse/LUCENE-7843
             Project: Lucene - Core
          Issue Type: Bug
          Components: core/index
    Affects Versions: 6.5.1
         Environment: Windows, MMapDirectory
            Reporter: Rei Shapira


DirectoryReader.listCommits expects FileNotFoundException and 
NoSuchFileException while trying to read a specific commit file - if these are 
thrown then that specific commit file is not returned in the list of all 
commits for that directory.

LUCENE-7662 changed the behavior of SegmentInfos.readCommit to not throw these 
exceptions anymore, but rather CorruptIndexException.

This causes the code in DirectoryReader.listCommits to never encounter the 
previous two exception types, thus throwing the CorruptIndexException all the 
way to the top, instead of gracefully handling a few missing commit files.

This breaks how Luke does a clean index operation when listing all of the 
commits and then proceeding to delete any files inside the index directory that 
were not mentioned by any of the commits.



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