Elasticsearch died with threaddump

Hi

Could somebody investigate threaddump? I think that elasticsearch itself is
not a problem but I don't understand why it's being killed. FYI, I upgraded
a certain river library, only changes are related with the shutdown part,
not initialization part. The symptom is, when I created _river index to
start indexing, instances are being killed with the attached threadump.

Thank you
Best, Jae

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