Hello Solr users,

I believe I found an unexpected behavior when using atomic updates with nested 
documents.

I am using Solr nested documents and noticed that performing an atomic update 
on a parent document removes its child documents.

I created a minimal example here:

https://gist.github.com/DarioViva42/c3de6142e7dd892f4279b1d62a275a35

To reproduce the example, first run AddDocument.java and then 
UpdateDocument.java

Observations:

- For 001, atomic updates (e.g. field changes) work normally.
- For 002, the age increment works correctly.
- However, after the update, the nested child document 003 is gone.

After the update the child document is no longer present.

Is this expected behavior/limitation of atomic updates with nested documents, 
or should this be considered a bug? I would have expected that the child 
documents stay.

If it is intended, I think it would be worth documenting clearly, since it is 
easy to accidentally remove nested documents with a seemingly safe atomic 
update.

Thanks,
Dario

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