in scripts/schema/subset_filter.py [0:0]
def strip_non_ecs_options(subset: Dict[str, Any]) -> None:
for key in subset:
subset[key] = {x: subset[key][x] for x in subset[key] if x in ecs_options}
if 'fields' in subset[key] and isinstance(subset[key]['fields'], dict):
strip_non_ecs_options(subset[key]['fields'])