Backfill argument not working in cli

Question

Hey I am currently extending our CI. Wanted to set Backfill to automatic via the cli but this throws me an error: "unknown options: --backfill-mode "AUTOMATIC" ". Did something change or is it documented wrongly?

Here is my CLI command:
` aws gamelift create-matchmaking-configuration --name "DEVELOPMENT-ONEVSZERO" --rule-set-name "DEVELOPMENT-ONEVSZERO" --game-session-queue-arns arn:******

Also:
`aws gamelift create-matchmaking-configuration --generate-cli-skeleton` 
Doesnt return anything backfill related:
`{                                                                       
    "Name": "",                                                         
    "Description": "",                                                  
    "GameSessionQueueArns": [                                           
        ""                                                              
    ],                                                                  
    "RequestTimeoutSeconds": 0,                                         
    "AcceptanceTimeoutSeconds": 0,                                      
    "AcceptanceRequired": true,                                         
    "RuleSetName": "",                                                  
    "NotificationTarget": "",                                           
    "AdditionalPlayerCount": 0,                                         
    "CustomEventData": "",                                              
    "GameProperties": [                                                 
        {                                                               
            "Key": "",                                                  
            "Value": ""                                                 
        }                                                               
    ],                                                                  
    "GameSessionData": ""                                               
} `

https://docs.aws.amazon.com/gamelift/latest/developerguide/match-create-configuration.html

Thanks,
Kris

Answer

Ahh updating did do the trick:

`{
    "Name": "",
    "Description": "",
    "GameSessionQueueArns": [
        ""
    ],
    "RequestTimeoutSeconds": 0,
    "AcceptanceTimeoutSeconds": 0,
    "AcceptanceRequired": true,
    "RuleSetName": "",
    "NotificationTarget": "",
    "AdditionalPlayerCount": 0,
    "CustomEventData": "",
    "GameProperties": [
        {
            "Key": "",
            "Value": ""
        }
    ],
    "GameSessionData": "",
    "BackfillMode": "MANUAL"
}`

Thanks!

Answer

I just tried this locally and it worked -- perhaps you need to upgrade the version of the cli that you're using?

Here's the version I have:

% aws --version
aws-cli/1.16.263 Python/3.6.9 Linux/4.9.184-0.1.ac.235.83.329.metal1.x86_64 botocore/1.12.253

Backfill argument not working in cli

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