Trying to make geospatial queries in mongoose

mongooseGeo.js

var mongoose = require('mongoose');
var Schema = mongoose.Schema;
var assert = require('assert')

console.log('\n===========');
console.log('    mongoose version: %s', mongoose.version);
console.log('========\n\n');

var dbname = 'testing_geojsonPoint23';
mongoose.connect('localhost', dbname);
mongoose.connection.on('error', function () {
  console.error('connection error', arguments);
});

// schema

var schema = new Schema({
  loc: {
      type: { type: String },
      coordinates: []
  },
  area: {
      type: { type: String, default: 'Polygon' },
      coordinates: { type: Array, required: true}
  }
});
schema.index({ loc: '2dsphere' });
schema.index({ area: '2dsphere' });
var A = mongoose.model('A', schema);

mongoose.connection.on('open', function () {
  //mongoose.connection.db.ensureIndex({ 'schema.area.coordinates': '2dsphere' });
  A.on('index', function (err) {
    if (err) return done(err);
    A.create({loc: { type: 'Point', coordinates: [-179.0, 0.0] },
     area: { type: 'Polygon', coordinates: [[
      [
        -44.12933349609375,
        -19.717585810896803622
      ],
      [
        -43.792877197265625,
        -19.718878576562225646
      ],
      [
        -43.8155364990234375,
        -20.153296932840667921
      ],
      [
        -44.1794586181640625,
        -20.109457638447803873
      ],
      [
        -44.129333496093757105,
        -19.717585810896803622
      ],
      [
        -44.12933349609375,
        -19.717585810896803622
      ]
    ]]
   }}, function (err) {
      if (err) return done(err);
      A.find({ area:{
         $near:
          {
            type: 'Point', coordinates: [-43.941932916641235,-19.931718548878326]
          }
        }
      }  , function (err, docs) {
        if (err) return done(err);
        console.log("FOUND DOCS: ",docs);
        done();
      });
    });
  });
});


function done (err) {
  if (err) console.error(err.stack);
  mongoose.connection.db.dropDatabase(function () {
    mongoose.connection.close();
  });
}


/**
 * THIS FAILS
  { area:
    {
     $geoWithin: {
       $geometry:
        {
         type: 'Point', coordinates: [-43.941932916641235,-19.931718548878326]
        }
      }
    }
  }
 */