setup.py tries to install Python modules

If the import of elasticsearch fails, setup.py tries to install some Python modules.
This uses pip3 and is unconditionally tried if the current user is root.

I think this is out of scope for the setup script.
It's also potentially dangerous to run external processes as root.
Also the installation may not be using pip3.

Setup.py should report an issue if a required module is missing, but should not unconditionally install them.

Start by reading setup.py around the elasticsearch import and the conditional pip3 invocation. Confirm the setup path reports the missing required module without launching an external installation process, especially when run as root; verify the resulting behavior with the project's available setup or installation checks.

Written by the indexing model from the issue text.