def METHOD_NAME(collection: Collection, field: str) -> bool:
    """Confirm index on store for at least one of fields
    One can't simply ensure an index exists via
    `store.collection.create_index` because a Builder must assume
    read-only access to source Stores. The MongoDB `read` built-in role
    does not include the `createIndex` action.
    Returns:
        True if an index exists for a given field
        False if not
    """
    info = list(collection.index_information().values())
    keys = {spec[0] for index in info for spec in index["key"]}
    return field in keys