Waterline, sum() mongodb adapter -> The 'cursor' option is required.

Sails@lastest-version
Node@stable-version

my action:

```
module.exports = {
friendlyName: 'Total',

description: 'Total finance.',

inputs: {
project: {
type: 'string',
required: true
}
},

exits: {},

fn: async function({ project }, exits) {
const listTotalFinances = await Finance.sum('value').where({
project
});
if (listTotalFinances) {
return exits.success(listTotalFinances);
}
}
};

```
Error info:

```
Sending 500 ("Server Error") response:
AdapterError: Unexpected error from database adapter: The 'cursor' option is required, except for aggregate with the explain argument
at Object.fn..
```

Im using MongoDB Atlas.

Start by reproducing the shown Finance.sum('value').where({ project }) action against MongoDB Atlas and inspect the MongoDB adapter path handling the aggregate query. Compare the cursor error with the expected sum result; done means the query completes without AdapterError and returns the total.

Written by the indexing model from the issue text.