Changes to kibana front-end do not apply

Hi everyone,
i’m totally new to elasticsearch and open distro, i managed to get the stack up and running with the deb packages in a local environment (version 7.2.0), i need to add some additional html to the kibana discover plugin so i was trying to change the index.html file located at

kibana/src/legacy/core_plugins/kibana/public/discover

but when i save the file and restart elasticsearch and kibana, my changes are not displayed, hell i even tried to delete the file and it doesn’t affect kibana at all, i’m wondering if i’m touching the right file…
it would be nice to get some feedback from you guys.