Nested objects indexing and efficiency

I'm trying to figure out the modeling and mapping which will be best suited for me, and have some questions regarding the Nested object concept, specifically the hidden document concept:

  1. How a mapping for a nested object will look like? It cannot be flatten like an object-type field, so what's this "magic" that make this joinable fastly ( ?
  2. Can someone elaborate about the disk space efficiency when using a nested object?

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