Github user jnioche commented on the issue:
https://github.com/apache/storm/pull/1896
As far as I understand, Storm uses SLF4J + LOG4J. I could not find a way to
run a topology where one of the dependencies relies on a more recent version of
log4j (Elasticsearch 5). A similar problem was reported on
https://issues.apache.org/jira/browse/STORM-1386.
Upgrading the dependencies in Storm solved the problem.
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