Very strange behaviour of nested documents

Hello everyone,
I have a very strange problem where when I create a mapping with two nested
properties, I can't find a document by querying on some subproperties of
these nested properties. If my document only has one nested property,
everything works fine. I just created an issue on the github
page: https://github.com/elasticsearch/elasticsearch/issues/9074, but I'm
thinking this problem may juste as well come from a miscomprehension of the
ES engine from my part. Can anyone shed any light on this problem?
Thanks in advance,
V.

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