**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
super().__init__(**kwargs)
        if self.concurrency is None:
            self.concurrency = conf.getint('core', 'dag_concurrency')
        if self.has_task_concurrency_limits is None:
            
            self.has_task_concurrency_limits = True
    def __repr__(self):
        return f"<DAG: {self.dag_id}>"
    @property
    def timezone(self):
        return settings.TIMEZONE
    @staticmethod
    @provide_session
    def get_dagmodel(dag_id, session=None):