azurerm_cosmosdb_mongo_collection order of compound keys in index matters

[yupwei68]

Fix #8572.
Confirmed from service team: Azure/azure-rest-api-specs#10909

=== RUN TestAccAzureRMCosmosDbMongoCollection_basic
=== PAUSE TestAccAzureRMCosmosDbMongoCollection_basic
=== CONT TestAccAzureRMCosmosDbMongoCollection_basic
--- PASS: TestAccAzureRMCosmosDbMongoCollection_basic (1859.98s)
=== RUN TestAccAzureRMCosmosDbMongoCollection_complete
=== PAUSE TestAccAzureRMCosmosDbMongoCollection_complete
=== CONT TestAccAzureRMCosmosDbMongoCollection_complete
--- PASS: TestAccAzureRMCosmosDbMongoCollection_complete (1919.78s)
=== RUN TestAccAzureRMCosmosDbMongoCollection_update
=== PAUSE TestAccAzureRMCosmosDbMongoCollection_update
=== CONT TestAccAzureRMCosmosDbMongoCollection_update
--- PASS: TestAccAzureRMCosmosDbMongoCollection_update (2197.21s)
=== RUN TestAccAzureRMCosmosDbMongoCollection_throughput
=== PAUSE TestAccAzureRMCosmosDbMongoCollection_throughput
=== CONT TestAccAzureRMCosmosDbMongoCollection_throughput
--- PASS: TestAccAzureRMCosmosDbMongoCollection_throughput (2137.38s)
=== RUN TestAccAzureRMCosmosDbMongoCollection_withIndex
=== PAUSE TestAccAzureRMCosmosDbMongoCollection_withIndex
=== CONT TestAccAzureRMCosmosDbMongoCollection_withIndex
--- PASS: TestAccAzureRMCosmosDbMongoCollection_withIndex (1926.99s)
=== RUN TestAccAzureRMCosmosDbMongoCollection_autoscale
=== PAUSE TestAccAzureRMCosmosDbMongoCollection_autoscale
=== CONT TestAccAzureRMCosmosDbMongoCollection_autoscale
--- PASS: TestAccAzureRMCosmosDbMongoCollection_autoscale (2244.46s)

[katbyte]

Thanks @yupwei68 - LGTM 👍

[ghost]

This has been released in version 2.30.0 of the provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading. As an example:

provider "azurerm" {
    version = "~> 2.30.0"
}
# ... other configuration ...

[ghost]

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