What is the default order of documents in a nested field when the parent document is retrieved?

In Elasticsearch 6.8 the order the documents in a nested fields are retrieved is the same order they where created.

Is this behavior intended, explicitly supported by Elasticsearch, or is this something that can change in the future?

I know it's possible to sort only the nested fields using something like this but if it's guaranteed that the default retrieve order is the same as the order the documents where store, I'll rather prefer to use this option.

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