The log is produced after i go to the web ui and reproduce the error of "Failed to get Plot Charts"

That's ok, i have just start the server. Could you tell me how to delete this index?

Please run these commands and see if you have any "red" statuses in the output:
curl " http://localhost:9200/_cluster/health?pretty "
curl " http://localhost:9200/_cluster/health?level=indices&pretty "

The index "events-plot-d1bd92a3b039400cbafc60a7a5b1e52b" is red meaning that it is corrupted and elastic cannot work with it. The most straightforward solution would be to delete this index but it will result in all the plots generated so far will be lost.