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This one should fix #763
It will also prevent various problems detected while investigating on this issue :
ensure to pass all configuration values to the client to ensure he will not call ScopeConfig->getValue during install process. Otherwise this leads to a fatal error due to the config not being already built by Magento.
skip validation step of the reachable ES server if no parameter is submitted on the command line.
ensure useless fields are not written into the env.php
And I also decided to cover this class with unit testing.
This one is meant to be merged on 2.5 and cascaded to master.
Let me know @afoucret