joins2

{
    {
      "_id": ObjectId("56005dda80c3678b19799e52"),
      "amount": 3000000,
      "date": ISODate("2012-04-19T00:00:00Z"),
      "address": {
        "nameOrNumber": "TEMPLE FERRY PLACE",
        "street": "MILL LANE",
        "town": "MAIDENHEAD",
        "county": "WINDSOR AND MAIDENHEAD",
        "postcode": "SL6 5ND"
      },
      "postcode_docs": [
        {
          "_id": ObjectId("560053e280c3678b1978b293"),
          "postcode": "SL6 5ND",
          "location": {
            "type": "Point",
            "coordinates": [
              51.549516,
              -0.80702
            ]
          }
        }
      ]
    },

...

      "postcode_docs": [
        {
          "_id": ObjectId("560053e280c3678b1978b524"),
          "postcode": "SL6 7RJ",
          "location": {
            "type": "Point",
            "coordinates": [
              51.536848,
              -0.735835
            ]
          }
        }
      ]
    }