Cannot create a mongodb collection using azure cli with an index policy

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Describe the bug

Command Name az cosmosdb mongodb collection create

Errors:

Unable to build a model: Cannot deserialize as [MongoIndex] an object of type <class 'dict'>, DeserializationError: Cannot deserialize as [MongoIndex] an object of type <class 'dict'>
Traceback (most recent call last):
Temp\pip-unpacked-wheel-ib_p0vwa\msrest\serialization.py, ln 571, in body
Temp\pip-unpacked-wheel-ib_p0vwa\msrest\serialization.py, ln 1261, in _deserialize
Temp\pip-unpacked-wheel-ib_p0vwa\msrest\serialization.py, ln 1261, in _deserialize
...
msrest.exceptions.SerializationError: Unable to build a model: Cannot deserialize as [MongoIndex] an object of type <class 'dict'>, DeserializationError: Cannot deserialize as [MongoIndex] an object of type <class 'dict'>

To Reproduce:

Steps to reproduce the behavior. Note that argument values have been redacted, as they may contain sensitive information.

• Put any pre-requisite steps here…
• az cosmosdb mongodb collection create -a {} -g {} -d {} -n {} --shard {} --throughput {} --idx {}

index.json

{
  "indexingMode": "consistent",
  "includedPaths": [
    {
      "path": "/*",
      "indexes": [
        {
          "kind": "Range",
          "dataType": "Number",
          "precision": -1
        },
        {
          "kind": "Range",
          "dataType": "String",
          "precision": -1
        }
      ]
    }
  ],
  "excludedPaths": [
    {
      "path": "/path/to/single/excluded/property/?"
    },
    {
      "path": "/path/to/root/of/multiple/excluded/properties/*"
    }
  ]
}

Expected Behavior

Environment Summary

Windows-10-10.0.17134-SP0
Python 3.6.8
Installer: MSI

azure-cli 2.10.1

Extensions:
azure-devops 0.17.0

Additional Context

[MehaKaushik]

Hey @nadworny

1. For Mongo 3.6 with apiVersion >=2020-04-01 _id is a required index. An index with a single key, equal to _id should be present. “key”: {“keys”: [“_id”]}

2. When creating indexes using Rest-API for Azure resource manager, there is no way to provide the sorting. By default, the sort order is set to 1. This is a known system limitation and we hope to fix it in the future. But no tentative timeline exists.

[MehaKaushik]

@nadworny glad to hear.