How to fix this Splunk Error:Connection closed by ...

Splunk Enterprise

Hello everyone,

I have 1 search head and 3 indexes with a index cluster, it worked fine until yesterday, today I can't search event, then I found this event from splunkd.log

08-16-2022 13:23:10.727 +0800 ERROR HttpListener [175497 TcpChannelThread] - Exception while processing request from 10.20.5.10:38210 for /services/streams/search?sh_sid=rt_scheduler__admin_U0EtQWNjZXNzUHJvdGVjdGlvbg__RMD53730174ad49bc45c_at_1660627323_2982: Connection closed by peer

10.20.5.10 is search head server,

What should I do?

Thanks

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