为什么CosmosDB在通过ARM模板创建文档集合时会忽略索引？

{
  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "cosmosDBAccountName": {
      "type": "string"
    },
    "databaseName": {
      "type": "string"
    },
    "collectionName": {
      "type": "string"
    }
  },
  "resources": [
    {
      "type": "Microsoft.DocumentDB/databaseAccounts",
      "apiVersion": "2021-03-15",
      "name": "[parameters('cosmosDBAccountName')]",
      "location": "[resourceGroup().location]",
      "kind": "GlobalDocumentDB",
      "properties": {
        "databaseAccountOfferType": "Standard"
      }
    },
    {
      "type": "Microsoft.DocumentDB/databaseAccounts/sqlDatabases",
      "apiVersion": "2021-03-15",
      "name": "[concat(parameters('cosmosDBAccountName'), '/sql/', parameters('databaseName'))]",
      "dependsOn": [
        "[resourceId('Microsoft.DocumentDB/databaseAccounts', parameters('cosmosDBAccountName'))]"
      ]
    },
    {
      "type": "Microsoft.DocumentDB/databaseAccounts/sqlDatabases/containers",
      "apiVersion": "2021-03-15",
      "name": "[concat(parameters('cosmosDBAccountName'), '/sql/', parameters('databaseName'), '/', parameters('collectionName'))]",
      "dependsOn": [
        "[resourceId('Microsoft.DocumentDB/databaseAccounts/sqlDatabases', parameters('cosmosDBAccountName'), 'sql/', parameters('databaseName'))]"
      ],
      "properties": {
        "resource": {
          "id": "[parameters('collectionName')]",
          "indexingPolicy": {
            "indexingMode": "consistent",
            "includedPaths": [
              {
                "path": "/*"
              }
            ],
            "excludedPaths": []
          }
        }
      }
    }
  ]
}