**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**



airflow/api_connexion/schemas/task_instance_schema.py
#
#
from typing import List, NamedTuple, Optional, Tuple
from marshmallow import Schema, ValidationError, fields, validate, validates_schema
from marshmallow.utils import get_value
from airflow.api_connexion.parameters import validate_istimezone
from airflow.api_connexion.schemas.enum_schemas import TaskInstanceStateField
from airflow.api_connexion.schemas.sla_miss_schema import SlaMissSchema
from airflow.models import SlaMiss, TaskInstance
from airflow.utils.state import State
class TaskInstanceSchema(Schema):