In post
https://issues.apache.org/jira/browse/LUCENE-5168
They speak about bug "Instance field load is replaced by wrong data Phi".
This bug appear resolved in 8u121
https://bugs.java.com/view_bug.do?bug_id=8038348
Can I use G1GC with Oracle JVM 8u121 and ES-5.6.2 at production environment without problem the index corruption?