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UserTest > testParseUserStringEmpty() STANDARD_OUT
    2022-09-07 18:19:52,830 Test worker ERROR Unable to locate plugin type for HeaderWarningAppender
    2022-09-07 18:19:52,907 Test worker ERROR Unable to locate plugin for HeaderWarningAppender
    2022-09-07 18:19:52,910 Test worker ERROR Unable to invoke factory method in class org.apache.logging.log4j.core.config.AppendersPlugin for element Appenders: java.lang.NullPointerException java.lang.NullPointerException
https://build.ci.opensearch.org/job/distribution-build-opensearch/6018/execution/node/379/log/
This is consistently reproducible right now, not on 2.x or 3.x, only on 1.x.