I use the low level App Engine data store API, as it gives me the
flexibility of having defining schemas on the fly, as Entities on the
app engine don't really need a schema.

Normally, if i needed to define a composite index that is based on an
Entity's property and its ancestor; i can do so by defining an index
in datastore-indexes.xml (by configuration). However, as the name of
the property in this case is / can be determined only during the
creation of the Entity itself, how can i mark properties of the Entity
on which i need the composite index to be created?

Is there a hook in the Datastore API that i can take advantage of ?
Any insight would be appreciated.

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