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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