Logstash Internal API server error

I am receiving error in logstash after upgraded from 7.11.x to 7.16.1
this log is not frequent, I feel some action is generating that log but I am not sure which action is generating this error, My pipelines are properly configured.
my logstash server does not has internet connection.
Please take a look at logstash error screen shot attached here.
let me know what can be responsible to generate this error.

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