There is nothing in the logs about any connection failures.
{"service":{"node":{"roles":["background_tasks","ui"]}},"ecs":{"version":"8.4.0"},"@timestamp":"2022-10-20T07:48:32.677-06:00","message":"Task ML:saved-objects-sync-task: No ML saved objects in need of synchronization","log":{"level":"INFO","logger":"plugins.ml"},"process":{"pid":75271},"trace":{"id":"04dbca5be63806a85b67f8766a46cbce"},"transaction":{"id":"a0e1cc766fb7848b"}}
That is repeated over and over about once an hour.