Concurrency bug in UnparsedTask?

[zhaih]

Got this exception in a run, and disappears when I rerun the benchmark, not investigated yet

Exception in thread "main" java.lang.NullPointerException: Cannot read field "groups" because "this.groupsResultTerms" is null
	at perf.SearchTask.toString(SearchTask.java:585)
	at java.base/java.lang.String.valueOf(String.java:4465)
	at java.base/java.util.concurrent.atomic.AtomicReference.toString(AtomicReference.java:276)
	at perf.UnparsedTask.toString(UnparsedTask.java:91)
	at java.base/java.lang.String.valueOf(String.java:4465)
	at perf.SearchPerfTest._main(SearchPerfTest.java:726)
	at perf.SearchPerfTest.main(SearchPerfTest.java:143)

[mikemccand]

Egads .toString() through an AtomicReference!