Updating Field in a Nested Subdocument MongoDB - node.js

Question

I'm trying to update the IsActive flag inside the function object, however, it is deeply nested inside the Companies and Factories Objects. Trying to use $ is no use, as it does not work with deeply nested subdocuments. Has anyone found a way to work with this???I expect the IsActive flag to be modified, as right now it can only be reached. I've tried:
$$
List item
Placing the $ at various points i.e. Factories.Functions.$.IsActive
-Concatenating in functionIds
{function deleteFunction(companyId, factoryId, functionId) {
return Companies.update({
"CompanyId": companyId,
"Factories.FactoryId": factoryId,
"Factories.Functions.FunctionId": functionId,
}, {"$set": {"Factories.$.Functions.IsActive": false}}
).then(function (result) {
console.log("Reached", result);
return result
}).catch(function (err) {
logger.log(err);
});
}}
let functionsSchema = new mongoose.Schema({
FunctionId: Number,
Name: String,
ADGroup: String,
IsActive: Boolean,
DateCreated: {
type: Date,
default: Date.now
},
DateModified: {
type: Date,
default: Date.now
}
});
let factorySchema = new mongoose.Schema({
FactoryId: Number,
Name: String,
ADGroup: String,
IsActive: Boolean,
DateCreated: {
type: Date,
default: Date.now
},
DateModified: {
type: Date,
default: Date.now
},
Functions: [functionsSchema]
});
let companySchema = new mongoose.Schema({
CompanyId: Number,
Name: String,
IsActive: Boolean,
DateCreated: {
type: Date,
default: Date.now
},
DateModified: {
type: Date,
default: Date.now
},
Employees: [employeeSchema],
Factories: [factorySchema]
});