Can you add debug nodes to the outputs of the mongo nodes, set to Output Complete Message, and capture the output and paste it here so I can simulate the flow. This canned text explains how to copy output from the debug window in a way that can be copied and used in a flow:
There’s a great page in the docs (Working with messages : Node-RED) that will explain how to use the debug panel to find the right path/value for any data item.
Pay particular attention to the part about the buttons that appear under your mouse pointer when you over hover a debug message property in the sidebar.
Also, in future, if posting a flow, code or data, rather than attaching a file, please use the method explained in this canned text:
In order to make code readable and usable it is necessary to surround your code with three backticks (also known as a left quote or backquote ```)
```
code goes here
```
See this post for more details - How to share code or flow json
