mongodb university - free course on index design
https://learn.mongodb.com/courses/mongodb-indexes
git subtree add gives you "Working tree has modifications. Cannot add"
While seems confusing, i think it is pretty clear it meant what it says. If you have any changes, please commit or stash it - make sure your branch is clean and neat :) Or sometimes if you don't have any modification, just run the command "git reset". And re-run the command.
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