Describe the bug
I successfully Connected meilisync with my MongoDB Atlas Database. If I don't use the "fields" argument in the yaml file, I receive the data, however as soon as I specify the fields, all data is None.

My config.yml:

plugins:
  - meilisync.plugin.Plugin
progress:
  type: file
  path: process.json
source:
  type: mongo
  host: ...
  username:...
  password:...
  database:...
meilisearch:
  api_url: ...
  api_key: ...
  insert_size: 1000
  insert_interval: 10
sync:
  - table: userschemas
    index: userschemas
    full: true
    pk: _id
    fields:
      _id:
      email:
      userName:
      firstName:
      lastName:
      gender:

Example of some dummy Data in Mongo DB:

Logging without Specification:

Logging with Specification:

Expected behavior:
Should Catch the Data given the provided fields

Desktop (please complete the following information):

• OS: Mac m1
• Python version: 3.11
• functime version: 0.1.3
• MongoDB Atlas
• meilisearch Cloud