Somehow today one of my indexes became corrupted.  

I get the following IO exception when trying to open the index:
Exception in thread "main" java.io.IOException: read past EOF
        at org.en.lucene.store.InputStream.refill(InputStream.java:154)
        at org.en.lucene.store.InputStream.readByte(InputStream.java:43)
        at org.en.lucene.store.InputStream.readVInt(InputStream.java:83)
        at org.en.lucene.index.FieldInfos.read(FieldInfos.java:195)
        at org.en.lucene.index.FieldInfos.<init>(FieldInfos.java:55)
        at org.en.lucene.index.SegmentReader.initialize(SegmentReader.java:109)
        at org.en.lucene.index.SegmentReader.<init>(SegmentReader.java:94)
        at org.en.lucene.index.IndexWriter.mergeSegments(IndexWriter.java:480)
        at org.en.lucene.index.IndexWriter.maybeMergeSegments(IndexWriter.java:458)
        at org.en.lucene.index.IndexWriter.addDocument(IndexWriter.java:310)
        at org.en.lucene.index.IndexWriter.addDocument(IndexWriter.java:294)
        at org.en.global.indexer2.Minnow.main(Minnow.java:142)

Any ideas on what could cause this type of corruption, and what I can
do to avoid it in the future.  Also, any ideas on repairing the index
if this happens?  I removed the index directory and marked the rows to
be reindexed from the database, but the data is unavailable to my
users while the index rebuilds.

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