In some scenarios it will be useful to be able to import entities from JSON without using a primary key.
This way it will always insert entities and never update.
This will also improve performance on scenarios when you have a primary key but you are always inserting.
I will contribute a pull request soon to implement this.
I was able to achieve this by adding an attribute <;entity;>ID and leaving it blank.
This is possible in both the upcoming 2.3 and 3.0 releases. Please checkout either the develop branch for 2.3 or release/3.0 for 3.0 pre-releases.