Log driver awslogs disallows options: log_key

Hi,

I am facing below error with ECS on Fargate platform while using fluentbit through awsfirelens for logging:
`An error occurred (ClientException) when calling the RegisterTaskDefinition operation: Log driver awslogs disallows options: log_key`

I have referred this example:

https://github.com/aws-samples/amazon-ecs-firelens-examples/tree/mainline/examples/fluent-bit/cloudwatchlogs

If I want to pick only log using log_key then what alternative do I have

Start with the linked examples/fluent-bit/cloudwatchlogs example and the ECS Fargate awsfirelens configuration described in the report. Investigate how log_key is passed to the awslogs driver and identify a supported way to select logs by key; done means the task definition no longer produces the reported disallowed-options error.

Written by the indexing model from the issue text.