[BUG] opensearch configuration should be in $XDG_CONFIG_HOME

[robfig]

What is the bug?

opensearch-cli creates a new directory in my home folder to store its configuration. The standard convention is to put it in $XDG_CONFIG_HOME instead, not $HOME. This standard is widely accepted & followed -- on my 1-month old workstation I have 48 sub-directories in ~/.config.

https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html

It is supported and accessible as os.UserConfigDir:
https://pkg.go.dev/os#UserConfigDir

[wbeckler]

Sounds reasonable. Feel free to submit a PR if you're up for it.