**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/models/dag.py
if cls._context_managed_dag:
            cls._previous_context_managed_dags.append(cls._context_managed_dag)
        cls._context_managed_dag = dag
    @classmethod
    def pop_context_managed_dag(cls) -> Optional[DAG]:
        old_dag = cls._context_managed_dag
        if cls._previous_context_managed_dags:
            cls._context_managed_dag = cls._previous_context_managed_dags.pop()
        else:
            cls._context_managed_dag = None
        return old_dag
    @classmethod
    def get_current_dag(cls) -> Optional[DAG]:
        return cls._context_managed_dag