I installed ES and deleted the Elasticsearch folder.
When I 'start over' from scratch with a clean installation, It does not creating certificate files?
How to clean ES installation from my machine ?
Welcome to our community! 
What OS are you using? How did you install things?
Thanks, I just started learning Elasticsearch,
I have installed on Windows 10 by running elasticsearch.bat file from command prompt.
Later I deleted the folder and trying to install again in new location but certificate does not create again.