Add an initialization callback about flask-pymongo HOT 3 CLOSED

Actually, just need to document this -- @app.before_first_request already does what we want (and sets up a context, which is what prevents from just having those indexes in the file). Need to be clear in docs that index creation can take a long time and might best be done in a script.

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Tasks like index creation shouldn't live inside the lifecycle of the application, they should really be run as one-off system level tasks.

I personally wouldn't suggest to anyone to run the ensure_index command when starting up an app. If someone was to naively create an index on a massive collection (experience talking) in the foreground you would lock up your entire database whilst it's building.

A better way to do this is just to check for the existence of an index with a specific name or spec and then throw a warning/error if it doesn't exist.

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@markunsworth agreed, we should not encourage people to do unwise things like creating indexes at app-start time, even just in docs. Closing.

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