End-to-end checksum validation is coming to Lucene!  This is big news, because it means Lucene will be able to detect if something in the hardware flipped bits in the index, so when index corruption occurs we can know (with high probability) it was a hardware issue and not e.g. a bug in Lucene.  Be sure to turn on the checking during IndexWriter merging using IndexWriterConfig.setValidateAtMerge(true).
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