**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
include_downstream=True,
                            )
                            tis = tis.union(
                                downstream.clear(
                                    start_date=tii.execution_date,
                                    end_date=tii.execution_date,
                                    only_failed=only_failed,
                                    only_running=only_running,
                                    confirm_prompt=confirm_prompt,
                                    include_subdags=include_subdags,
                                    include_parentdag=False,
                                    dag_run_state=dag_run_state,
                                    get_tis=True,
                                    session=session,
                                    recursion_depth=recursion_depth + 1,
                                    max_recursion_depth=max_recursion_depth,
                                    dag_bag=dag_bag,
                                    visited_external_tis=visited_external_tis,
                                )
                            )
                        visited_external_tis.add(ti_key)
        if get_tis:
            return tis
        tis = tis.all()
        if dry_run:
            session.expunge_all()
            return tis
        
        
        count = len(tis)