When looking to do aggregations on a subset of documents in arrays, the current "best" practice is to do $match first, then $unwind then $match again.

In other words, if our pipeline is:
{$match:{array.Member:"value"}},{$unwind:"$array"},{$match:{"array.Member":"value"}}

if we can optimize this into something that eliminates unneeded array elements along with unneeded fields this could be reduced to one $match and no $unwind.

redbeard0531 this is what we talked about yesterday, please re-write the description if I didn't capture what we were discussing accurately.