mongoose-array-update.js

YOURMODEL
{
  _id 
  process       : [{
                      _id         : //mongo generate automatic
                      title       : {type: Schema.Types.Mixed, default: {}},
                      description : {type: Schema.Types.Mixed, default: {}},
                      image       : {type: String},
                      order       : {type: Number}
                    }]
}
----------------
YOURMODEL.update({_id: "564f333694a7b47c1dd9bb20", 'process._id': "564f333794a7b47c1dd9bb21"},
      {$set:{ 'process.$.title': 'omer test' }} ,function(err, res){
    console.log(err, res);
  });