incomplete results by mongoDB aggregation query -

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i have mongo collection sample structure 

{     "_id" : objectid("57835fd76898868d7d110228"),     "name" : "family vision clinic - doctors of optometry",     "website" : "familyvisionclinic.ca",     "phone" : null,     "address" : {         "street" : "650 portland st",         "city" : "dartmouth",         "state" : "nova scotia",         "zip" : "b2w6a",         "country" : "canada"     },     "profile_url" : "https://www.haha.org",  }

i want group entries country

here's have tried

db.subset.aggregate([{ "$unwind": "$address" }, { "$group":{"_id": "$address.country","count":{"$sum":1}}}])

but giving me incomplete results. mean many entries have united states country can see through eyeballing data while after running query no entry united states country

usa entry

{     "_id" : objectid("57835fd76898868d7d110226"),     "name" : "doctors of optometry",     "website" : "eyedoctorandglasses.com",     "phone" : null,     "address" : {         "street" : "4505 sepulveda blvd",         "city" : "torrance",         "state" : "ca",         "zip" : "90505",         "country" : "united states"     },     "profile_url" : "https://www.haha2.org",     "id" : "3330542" }


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