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https://issues.apache.org/jira/browse/LUCENE-4754?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13571350#comment-13571350
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Michael McCandless commented on LUCENE-4754:
--------------------------------------------
Actually this is sort of odd: since IW was asked to CREATE ... it should not
have been reading anything from the index that would lead to
IndexFormatTooOldException.
Do you have the full exception? Did you hit the exception on opening
IndexWriter, or later (during indexing/committing or something).
> IndexWriter can't handle old lucene inex format when opened with create mode
> ----------------------------------------------------------------------------
>
> Key: LUCENE-4754
> URL: https://issues.apache.org/jira/browse/LUCENE-4754
> Project: Lucene - Core
> Issue Type: Bug
> Affects Versions: 4.1
> Reporter: i30817
> Priority: Minor
>
> IndexWriter indexWriter = new IndexWriter(cacheDir,
> new IndexWriterConfig(Version.LUCENE_41, englishAnalyzer).
> setOpenMode(IndexWriterConfig.OpenMode.CREATE));
> Fails with CorruptedIndex subclass, IndexTooOldException (or something like
> that), even though the config would just replace the files.
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