Entity indexed=False not preserved in helpers.entity_from_protobuf

[dhermes]

In entity_from_protobuf a key is created and the values are added via

    for property_pb in pb.property:
        value = _get_value_from_property_pb(property_pb)
        entity[property_pb.name] = value

However, property_pb.value.indexed is ignored and entity has the default empty tuple for exclude_from_indexes.

---

To see this, first save with exclude_from_indexes non-empty and inspect the protobuf values:

>>> from gcloud import datastore
>>> from gcloud.datastore.entity import Entity
>>> from gcloud.datastore.key import Key
>>>
>>> datastore.set_default_connection()
>>> datastore.set_default_dataset_id('foo')
>>>
>>> e = Entity(key=Key('Foo', 1), exclude_from_indexes=('foo', 'bar'))
>>> e.update({
...     'foo': 10,
...     'bar': 11,
...     'baz': 12,
... })
>>> e.save()
>>>
>>> entity_pb, = datastore.get_connection().lookup(
...         dataset_id=e.key.dataset_id,
...         key_pbs=[e.key.to_protobuf()],
... )
>>> for p in entity_pb.property:
...     print p.value.indexed
...
True
False
False

then use the key to get (which calls get_entities -> entity_from_protobuf), save the newly created (supposedly identical) Entity. After saving, check the same protobuf values:

>>> e_retrieved = e.key.get()
>>> e_retrieved.save()
>>>
>>> entity_pb, = datastore.get_connection().lookup(
...         dataset_id=e_retrieved.key.dataset_id,
...         key_pbs=[e_retrieved.key.to_protobuf()],
... )
>>> for p in entity_pb.property:
...     print p.value.indexed
...
True
True
True