Updating multiple elements in a Mongo document array

example.js

// Example document structure
{
    "balance": {
        "start": 0,
        "end": 0
    },
    "transactions": [
        { "balance": 0 },
        { "balance": 0 },
        { "balance": 0 },
        { "balance": 0 },
        { "balance": 0 }
    ]
}
 
// Existing update query
db.transaction.update({}, { $inc: { 'balance.start': 5, 'balance.end': 5 } }, { multi: true })