def _field_path_to_elasticsearch_field_name(field_path):
    """Take a field_path tuple - for example: ("va", "info", "AC"), and converts it to an
    elasicsearch field name.
    """

    # drop the 'v', 'va' root from elastic search field names
    return "_".join(field_path[1:] if field_path and field_path[0] in ("v", "va") else field_path)