Fix insert-events.sh

Problem Description:

New training_run-*-events.json files include ...,"host":"{\"ip\":\"10.42.0.221\"}",... records instead of previous ...,"host":"192.168.44.15",.... The script should escape quotes around curl brackets. Otherwise, the data inserted into ELK are wrong.

Solution 1: Replace with ...,"host":{"ip":"10.42.0.221"},...:

LINE=$(echo "$LINE" | sed 's/"[{]/\{/g' | sed 's/\}"/\}/g'| sed 's/\\//g' | sed 's/"\[/\[/g' | sed 's/\]"/\]/g')

Solution 2: Replace with ...,"host":"{ip:10.42.0.221}",...:

LINE=$(echo "$LINE" | sed 's/\\\"//g' | sed 's/\\//g' | sed 's/"\[/\[/g' | sed 's/\]"/\]/g')