It's possible to make it searchable, you will need to store and update two
entities. MyEntity will have a Properties to Values map, and you have a
PropertiesEntity that has a MyEntity to Values map.
class MyEntity {
@Id Long id;
@Serialized Map<String,Object> properties
}
class MyProperties {
@Id String id;
@Serialized Map<Long,Object> values
}
Searching by property will become very cheap and fast since you'll simply
fetch the property entity. Updates and Writes will be more complex since
you will need to write 2 entities, but there should only be a total of 4
write ops. The other way is likely to be more expensive since you will use
(2 + 2 * properties) write ops for each entity because each property will
need to be indexed.
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