**Description**

I have noticed that the stable REST API doesn't have the ability to run a task (which is possible from the airflow web interface.
I think it would be nice to have either:
- Run task 
- Run all failing tasks (rerun from point of failure)
this ability for integrations.

**Use case / motivation**

I would like the ability to identify the failing tasks on a specific DAG Run and rerun only them.
I would like to do it remotely (non-interactive) using the REST API.
I could write a script that run only the failing tasks, but I couldn't find a way to "Run" a task, when I have the task instance ID.

**Are you willing to submit a PR?**

Not at this stage

**Related Issues**



tests/api_connexion/schemas/test_task_instance_schema.py
@parameterized.expand(
        [
            (
                [
                    {
                        "dry_run": False,
                        "reset_dag_runs": True,
                        "only_failed": True,
                        "only_running": True,
                    }
                ]
            ),
            (
                [
                    {
                        "dry_run": False,
                        "reset_dag_runs": True,
                        "end_date": "2020-01-01T00:00:00+00:00",
                        "start_date": "2020-01-02T00:00:00+00:00",
                    }
                ]
            ),
        ]
    )
    def test_validation_error(self, payload):
        with pytest.raises(ValidationError):
            clear_task_instance_form.load(payload)
class TestSetTaskInstanceStateFormSchema(unittest.TestCase):