How to sort child entities using datastore api

[Sai Pullabhotla via StackOverflow]

Your query is considered to be a Kindless query, because you are not querying for a specific Kind (e.g. Address or Employee). You are just saying get me all Entities that have the specified ancestor. Kindless queries can only be sorted by Key (__key__). No other properties are supported.

The documentation states that -

Kindless queries

A query with no kind and no ancestor retrieves all of the entities of an application from Cloud Datastore. Such kindless queries cannot include filters or sort orders on property values. They can, however, filter on entity keys and use ancestor filters. Key filters can be used by specifying key as the property name:

You might want to look into modifying your model to store Addresses as an Embedded List into the Empoyee Entities and see if that works better.

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