I was wondering how the datastore updates indexes. For example,
suppose I have an entity with 20 properties (with many implicit
indexes), and I change only one of those properties and put() back the
entity. Would the datastore know to only update the indexes which
apply to that property, or would it waste precious CPU updating the
indexes of all 20 properties???

If the latter is the case, then this should indeed be fixed....

Basically the datastore should realize which properties (if any) were
changed and only update those that are different.
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