Here's a Python async function. What would the Elixir version be like?

I have a function repair_file_in_place(path) that makes HTTP connections to check links for 404 errors.

Here’s the Python code to run repair_file_in_place() concurrently on all the markdown files in a directory:

async def repair_files_in_directory(path: str):
    """
    Repair all markdown files recursively in a directory.
    """
    async with aiohttp.ClientSession() as session:
        async with asyncio.TaskGroup() as group:
            for root, _, files in os.walk(path):
                for file in files:
                    if file.endswith(".md"):
                        group.create_task(repair_file_in_place(os.path.join(root, file), session))

• How would the code be structured in Elixir / OTP?
• Is there some kind of semaphore-like ability to limit the concurrency? My use case is not blowing the ulimit on open files.