Support for table field call by "." symbol during $project execution

[Ktoski]

Call for field by operator "." it seems to be not working using mongo-java-server.
ex.
"
{
$project: {
user: "$user._id",
},
}
"
where is "user" is a table in this example
Simiar case to mongo function "$toString"
ex. '$toString: "$_id" '

[Jofishy]

I think I'm seeing the same issue with $graphFollow. I have documents with the following format and I'm trying to graph follow based on the directReports.employeeId

{
    "employeeId": "16a596ae-edd3-4847-99fe-c4518e82c86f",
    "firstName": "John",
    "lastName": "Lennon",
    "position": "Development Manager",
    "department": "Engineering",
    "directReports": [
      {
        "employeeId": "b7839309-3348-463b-a7e3-5de1c168beb3"
      },
      {
        "employeeId": "03aa1462-ffa9-4978-901b-7c001562cf6f"
      }
    ]
  }, ...

Here is my query

db.collection.aggregate([
  {
    $match: {
      "employeeId": "16a596ae-edd3-4847-99fe-c4518e82c86f"
    }
  },
  {
    $graphLookup: {
      from: "collection",
      startWith: "$directReports.employeeId",
      connectFromField: "directReports.employeeId",
      connectToField: "employeeId",
      as: "allReports"
    }
  },
  
])

In mongoplayground.net this is working as expected, with the "allReports" field in the output being populated with all child employees. But using it here I'm seeing that the allReports array is empty like so: "allReports": []