Can you see if anything is cleaned up at all?
As by default Kentico tries to remove 10% of the max row you have set in the settings... which would be around 200. So if you have 1.100.000 (if I got the meaning of Lakh correctly :)) removing 200 a time isn't a lot. Considering a production site can easily create thousand records in a minute.
If you see that some of the older records are cleaned try setting the "Event log size" to 300.000 (making the cleanup around 30.000 records a time).
If you don't see any action might be wise to just manually script and remove event log records from the database.
e.g. to remove anything from before jan 1st of this year.
WHERE EventTime < '2019-01-01'
Be aware running direct SQL scripts isn't recommended and be sure to always create a db backup before