ElasticSearch pod restart very slowly

Hi all, recently I encountered a restart issue of Elasticsearch. I have a cluster with 3 nodes, last time I changed some configurations and the pod get restarted, however the pod state took almost 5 hours to become 1/1.
ElasticSearch version is 7.3.0, the primary shard is 50, active shards is 100 and 3 data nodes
I used kubectl describe po <podName>, it only had readiness probe failed warning, like

I used kubectl logs <podname>, but no log returned.

What else can I do to check what happen during the pod restart.

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