Elasticsearch remote debug issue

I start a ES server on my remote machine and open debug port to listen to. then I open my desktop IDE to remote debug that server.
I'd like to simulate concurrent update but failed bacause when the first update request the server and stoped on the breakpoint I setup, then the second update request will throw exception "None of the configured nodes are available" .
actually it is the same update code.

anyone please help to pick this issue and share some insight

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