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As far as I know Rally requires python3 and can not be run using python2.
Seems like you are right. In that case i have to recover 3.6 and make sure to build it with ssl. Might be a challenge since i don't have much experience with linux.
Edit: I managed to install it by now, while trying to run esrally or esrally configuration i got:
ModuleNotFoundError: No module named 'esrally'