Right, in general when you see a token whose name starts with
underscore (like _driver), that generally means it's an internal
implementation detail that may change at any time. And in fact, Meteor
0.5.0 did change things so that _driver isn't stored on the collection
anymore.
There's no officially supported way to call ensureIndex in Meteor
right now... but since you're already willing to use unofficial ways
that might break in future versions, I'll point out that 0.5.0 does
add an internal "_ensureIndex" method on Collections...
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