Lucene logging in ElasticSearch logs

I am on Elasticsearch 7.6.1 and to debug some issues, want to enable lucene logging in ES logs. Can anyone help with how can enable that?

I think you can use this:

And activate debug for org.apache.lucene packages.

Ah yes, I saw that but enabled it like following since Engine class path is appended -

curl -X PUT "localhost:9200/_cluster/settings?pretty" -H 'Content-Type: application/json' -d'
  "persistent": {
    "": "trace"

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