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The process of utilizing the previous task definition in ECS and deploying it through Bitbucket pipeline involves the following steps:

1. Create a repository in Bitbucket for storing the task definition and related files.

2. Add the necessary AWS credentials (access and secret keys) to the Bitbucket repository as environment variables.

3. Configure the Bitbucket pipeline to use the AWS CLI commands for deploying the task definition.

4. Use the AWS CLI to create a new task definition or update the existing one with the necessary changes and save it in the repository.

5. Push the updated task definition and related files to the Bitbucket repository.

6. The Bitbucket pipeline will detect the changes and trigger the deployment process.

7. The pipeline will use the AWS CLI to deploy the new or updated task definition to the ECS cluster specified in the deployment configuration.

8. Once the deployment is complete, the pipeline will send a notification to the configured channels.

9. Monitor the ECS service to ensure that the new task definition is running as expected.