**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
#
#
import datetime as dt
import getpass
import unittest
import pytest
from marshmallow import ValidationError
from parameterized import parameterized
from airflow.api_connexion.schemas.task_instance_schema import (
    clear_task_instance_form,
    set_task_instance_state_form,
    task_instance_schema,
)
from airflow.models import DAG, SlaMiss, TaskInstance as TI
from airflow.operators.dummy import DummyOperator
from airflow.utils.session import create_session, provide_session
from airflow.utils.state import State
from airflow.utils.timezone import datetime
class TestTaskInstanceSchema(unittest.TestCase):