[BUG] Microsoft.DocumentDB - lack of property autoscaleSettings in GET of mongodbDatabases

[dj-r1]

API Spec link

https://github.com/Azure/azure-rest-api-specs/blob/main/specification/cosmos-db/resource-manager/Microsoft.DocumentDB/stable/2024-08-15/cosmos-db.json

API Spec version

2024-08-15, 2024-02-15-preview

Describe the bug

In a ARM template (Bicep) of Microsoft.DocumentDB/databaseAccounts/mongodbDatabases

{
  "type": "Microsoft.DocumentDB/databaseAccounts/mongodbDatabases",
  "apiVersion": "2024-05-15",
  "name": "string",
  "location": "string",
...
  "properties": {
    "options": {
      "autoscaleSettings": {
        "maxThroughput": "int"
      },
      "throughput": "int"
    },
    "resource": {
      "createMode": "string",
      "id": "string",
...
    }
  }
}

points out that CreateUpdateOptionsOrMongoDBDatabaseGetPropertiesOptions is a part of the template, so in GET request it may be in a response, but in az rest and az cosmosdb mongodb database show response is not.

Example CosmosDBMongoDBDatabaseGet.json has a response with main properties of the resource without CreateUpdateOptionsOrMongoDBDatabaseGetPropertiesOptions. In Cosmos DB REST API - Get a Database it's the same.

In my case I struggle with What-If operation response showing me lack of autoscaleSettings.maxThroughput in Azure, where it's set and valid. I assume arm-template-whatif receives information from Azure REST API and compares it with my generated ARM template (Bicep).

Should CreateUpdateOptionsOrMongoDBDatabaseGetPropertiesOptions be a part of GET mongoDB database? Or could you guide me to the root cause?

I know that there is a separate Microsoft.DocumentDB/databaseAccounts/mongodbDatabases/mongodbCollections/throughputSettings extension resource with adequate example CosmosDBMongoDBCollectionThroughputGet.json. In my case I tried use it, but without good result.

Expected behavior

{
  "id": "/subscriptions/aaaaaaaa-0000-1111-2222-bbbbbbbbbbbb/resourceGroups/my-rg/providers/Microsoft.DocumentDB/databaseAccounts/my-cosmos-account/mongodbDatabases/my-mongo-db",
  "name": "my-mongo-db",
  "properties": {
    "options": {
      "autoscaleSettings": {
        "maxThroughput": 1000
      }
    },
    "resource": {
      "id": "my-mongo-db"
    }
  },
  "type": "Microsoft.DocumentDB/databaseAccounts/mongodbDatabases"
}

Actual behavior

{
  "id": "/subscriptions/aaaaaaaa-0000-1111-2222-bbbbbbbbbbbb/resourceGroups/my-rg/providers/Microsoft.DocumentDB/databaseAccounts/my-cosmos-account/mongodbDatabases/my-mongo-db",
  "name": "my-mongo-db",
  "properties": {
    "resource": {
      "id": "my-mongo-db"
    }
  },
  "type": "Microsoft.DocumentDB/databaseAccounts/mongodbDatabases"
}

Reproduction Steps

az cosmosdb mongodb database show --resource-group 'my-rg' --name 'my-mongo-db' --account-name 'my-cosmos-account' 

||
az rest --method get --header "Accept=application/json" --url 'https://management.azure.com/subscriptions/aaaaaaaa-0000-1111-2222-bbbbbbbbbbbb/resourceGroups/my-rg/providers/Microsoft.DocumentDB/databaseAccounts/my-cosmos-account/mongodbDatabases/my-mongo-db?api-version=2024-08-15'
||
GET https://management.azure.com/subscriptions/aaaaaaaa-0000-1111-2222-bbbbbbbbbbbb/resourceGroups/my-rg/providers/Microsoft.DocumentDB/databaseAccounts/my-cosmos-account/mongodbDatabases/my-mongo-db?api-version=2024-08-15

Environment

No response

[v-jiaodi]

@carjackson-msft Please help take a look, thanks.