在Airflow DAG中，可以使用CreateJobFlowOperator和EmrAddStepsOperator操作符创建EMR集群并向其添加步骤。CreateJobFlowOperator可以接收EMR集群的各种配置选项，包括AutoTerminationPolicy。示例代码如下：

from datetime import datetime
from airflow import DAG
from airflow.providers.amazon.aws.operators.emr_create_job_flow import EmrCreateJobFlowOperator
from airflow.providers.amazon.aws.operators.emr_add_steps import EmrAddStepsOperator
from airflow.models import Variable

# Get the AWS connection id from Airflow's UI
aws_conn_id = Variable.get('aws_connection_id')

# Define the DAG
dag = DAG(
    dag_id='emr_example',
    default_args={
        'owner': 'airflow',
        'start_date': datetime(2021, 1, 1)
    },
    schedule_interval=None
)

# Define the EMR create job flow operator
create_job_flow = EmrCreateJobFlowOperator(
    task_id='create_job_flow',
    aws_conn_id=aws_conn_id,
    emr_conn_id=aws_conn_id,
    job_flow_overrides={
        'Name': 'example_emr_cluster',
        'ReleaseLabel': 'emr-6.2.0',
        'LogUri': 's3://example-bucket/emr-logs',
        'Instances': {
            'InstanceGroups': [
                {
                    'Name': 'Master nodes',
                    'InstanceRole': 'MASTER',
                    'InstanceType': 'm5.xlarge',
                    'InstanceCount': 1
                },
                {
                    'Name': 'Worker nodes',
                    'InstanceRole': 'CORE',
                    'InstanceType': 'm5.xlarge',
                    'InstanceCount': 2
                }
            ],
            'Ec2KeyName': 'example_keypair',
            'KeepJobFlowAliveWhenNoSteps': True,
            'TerminationProtected': False,
            'Ec2SubnetId': 'subnet-0123456789abcdef0',
            'EmrManagedMasterSecurityGroup': 'sg-0123456789abcdef0',
            'EmrManagedSlaveSecurity