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TRUNK-5528:Upgrade org.apache.lucene sub Libraries #3121
@dkayiwa I saw the failure and I was researching on the cause and this is my conclusion concerning Travis CI failure. Lucene 5 by default only read indexes created with Lucene 5. To read and upgrade Lucene 4.x (4.10.4)indexes, I must add the lucene-backward-codecs.jar to the classpath. for it is recommended to upgrade the old indexes with the IndexUpgrader tool, so as to remove the backward-codecs module from classpath to improve performance.