mongoexport

# Data 
{
	"_id" : ObjectId("5744753e97bfc8000a18e3b2"),
	"breeds" : [
		"pomeranian"
	],
	"colors" : [
		"apricot"
	],
	"delinquent" : false,
	"isDeleted" : false,
	"weight" : 10,
	"name" : "Zoloft",
	"deletionReason" : null,
	"species" : null,
	"sex" : "spay",
	"birth" : null,
	"owner" : ObjectId("5413490f3a31c400077d6c8d"),
	"microchip" : null,
	"deletedBy" : null,
	"jurisdiction" : "Jo Davies",
	"deletionDate" : null,
	"vaccinations" : [
		{
			"type" : "1 year rabies",
			"user_id" : "https://api.stormpath.com/v1/accounts/3aUTDjDnVxNIz6nfgA6iuW",
			"vetName" : "Alan Schroeder",
			"nextVac" : ISODate("2017-06-02T05:00:00Z"),
			"org_id" : ObjectId("5750895384736c00099a4e97"),
			"organization" : "Mt. Carroll Veterinary Clinic",
			"pet" : ObjectId("5744753e97bfc8000a18e3b2"),
			"date" : ISODate("2016-06-02T05:00:00Z"),
			"_id" : ObjectId("5750895384736c00099a4e98")
		}
	],
	"registrations" : [
		{
			"tagNumber" : "%%%%%",
			"type" : "1 year",
			"nextReg" : ISODate("2017-05-26T05:00:00Z"),
			"lifetime" : false,
			"pet" : ObjectId("5744753e97bfc8000a18e3b2"),
			"_id" : ObjectId("5747d038a303b70009e22d88"),
			"user_id" : "https://api.stormpath.com/v1/accounts/3aUTDjDnVxNIz6nfgA6iuW",
			"date" : ISODate("2016-05-26T05:00:00Z"),
			"organization" : "Jo Davies",
			"org_id" : ObjectId("5747d038a303b70009e22d87"),
			"microchip" : "!!!!!!!!!!!"
		},
		{
			"type" : "1 year",
			"user_id" : "https://api.stormpath.com/v1/accounts/3aUTDjDnVxNIz6nfgA6iuW",
			"org_id" : ObjectId("5750895c84736c000a01d7e0"),
			"organization" : "Carroll County",
			"microchip" : "315145",
			"tagNumber" : "12346",
			"pet" : ObjectId("5744753e97bfc8000a18e3b2"),
			"date" : ISODate("2016-06-02T05:00:00Z"),
			"_id" : ObjectId("5750895c84736c000a01d7e1"),
			"lifetime" : false,
			"nextReg" : ISODate("2017-06-02T05:00:00Z")
		}
	]
}

# query w/ $elemMatch
db.dogs.find({
  "registrations": {
    "$elemMatch": {
      "date" : {
        "$gte": new ISODate("2016-06-01T01:00:00Z"),
        "$lt":  new ISODate("2016-06-06T05:00:00Z")
        }
      }
    }
},{
  _id:0,
  registrations:{
    "$elemMatch": {
      date:{
        "$gte": new ISODate("2016-06-01T01:00:00Z")
      }
    }
  }
}).pretty()

# Return value
{ "_id" : ObjectId("540e116bb209ca5198c247cf") }

# Desired Return value
"registrations" : [
		{
			"type" : "1 year",
			"org_id" : ObjectId("5750895c84736c000a01d7e0"),
			"organization" : "Carroll County",
			"tagNumber" : "12346",
			"pet" : ObjectId("5744753e97bfc8000a18e3b2"),
			"date" : ISODate("2016-06-02T05:00:00Z"),
		}
	]