Book representation in Cosmos DB

book1.json

{
    "id": "208c4a3f-d4cf-4b2f-9ece-a4bc207b3aeb",
    "BookId": "208c4a3f-d4cf-4b2f-9ece-a4bc207b3aeb",
    "Discriminator": "Book",
    "Publisher": "Wrox Press",
    "Title": "Professional C# 7 and .NET Core 2.0",
    "_rid": "Q-86ALyw0XkBAAAAAAAAAA==",
    "_self": "dbs/Q-86AA==/colls/Q-86ALyw0Xk=/docs/Q-86ALyw0XkBAAAAAAAAAA==/",
    "_etag": "\"05002269-0000-0000-0000-5b87d7630000\"",
    "_attachments": "attachments/",
    "_ts": 1535629155
}