Rename --dag to --dag-id in backfill CLI command

airflow/cli/cli_config.py

@@ -304,7 +304,7 @@ def string_lower_type(val):
 
 
 # backfill
-ARG_BACKFILL_DAG = Arg(flags=("--dag",), help="The dag to backfill.", required=True)
+ARG_BACKFILL_DAG = Arg(flags=("--dag-id",), help="The dag to backfill.", required=True)
 ARG_BACKFILL_FROM_DATE = Arg(
     ("--from-date",), help="Earliest logical date to backfill.", type=parsedate, required=True
 )

airflow/cli/commands/backfill_command.py

@@ -63,22 +63,22 @@ def create_backfill(args) -> None:
     if args.dry_run:
         _do_dry_run(
             params=dict(
-                dag_id=args.dag,
+                dag_id=args.dag_id,
                 from_date=args.from_date,
                 to_date=args.to_date,
                 max_active_runs=args.max_active_runs,
                 reverse=args.run_backwards,
                 dag_run_conf=args.dag_run_conf,
                 reprocess_behavior=reprocess_behavior,
             ),
-            dag_id=args.dag,
+            dag_id=args.dag_id,
             from_date=args.from_date,
             to_date=args.to_date,
             reverse=args.run_backwards,
         )
         return
     _create_backfill(
-        dag_id=args.dag,
+        dag_id=args.dag_id,
         from_date=args.from_date,
         to_date=args.to_date,
         max_active_runs=args.max_active_runs,

docs/apache-airflow/core-concepts/backfill.rst

@@ -60,7 +60,7 @@ Example:
 
 .. code-block:: bash
 
-    airflow backfill create --dag tutorial \
+    airflow backfill create --dag-id tutorial \
         --start-date 2015-06-01 \
         --end-date 2015-06-07 \
         --reprocessing-behavior failed \

docs/apache-airflow/core-concepts/dag-run.rst

@@ -153,7 +153,7 @@ This can be done through API or CLI. For CLI usage, run the command below:
 
 .. code-block:: bash
 
-    airflow backfill create --dag DAG_ID \
+    airflow backfill create --dag-id DAG_ID \
         --start-date START_DATE \
         --end-date END_DATE \
 

docs/apache-airflow/start.rst

@@ -110,7 +110,7 @@ run the commands below.
     # run your first task instance
     airflow tasks test example_bash_operator runme_0 2015-01-01
     # run a backfill over 2 days
-    airflow backfill create --dag example_bash_operator \
+    airflow backfill create --dag-id example_bash_operator \
         --start-date 2015-01-01 \
         --end-date 2015-01-02
 

tests/cli/commands/test_backfill_command.py

@@ -77,7 +77,7 @@ def test_backfill(self, mock_create, repro, expected_repro):
         args = [
             "backfill",
             "create",
-            "--dag",
+            "--dag-id",
             "example_bash_operator",
             "--from-date",
             DEFAULT_DATE.isoformat(),