[jira] [Created] (LUCENE-5684) Add best effort detection when index is removed & recreated before openIfChanged

["Michael McCandless (JIRA)" <ji...@apache.org>]

Michael McCandless created LUCENE-5684:
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             Summary: Add best effort detection when index is removed & recreated before openIfChanged
                 Key: LUCENE-5684
                 URL: https://issues.apache.org/jira/browse/LUCENE-5684
             Project: Lucene - Core
          Issue Type: Improvement
            Reporter: Michael McCandless
            Assignee: Michael McCandless
             Fix For: 4.9, 5.0


I dug into the confusing NPE from the java-user email with subject "[lucene 4.6] NPE when calling IndexReader#openIfChanged".

It happens because the app was opening an IndexReader, then rm -rf the entire index, build a new one, then calling reopen.  This is invalid usage (the app should instead use IW.deleteAll, or open new IW with OpenMode.CREATE), but I'd like to add a minor best effort check...



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