key property
The entity's key.
An entity must have a key, unless otherwise documented (for example,
an entity in Value.entity_value
may have no key).
An entity's kind is its key path's last element's kind,
or null if it has no key.
Implementation
@$pb.TagNumber(1)
Key get key => $_getN(0);
Implementation
@$pb.TagNumber(1)
set key(Key v) { setField(1, v); }