LUCENE-2446 added checksums to Lucene segment files. We could expose CheckIntegrityAtMerge in the indexConfig tag in solrconfig.xml.
Something like -
<!-- Use true to enable this safety check, which can help reduce the risk of propagating index corruption from older segments into new ones, at the expense of slower merging. --> <checkIntegrityAtMerge>false</checkIntegrityAtMerge>