SearchGuard update ACL document

If I am understanding the ACL configurations in SearchGuard, they are all stored in one ElasticSearch document under searchguard/ac/ac. Is it possible to use the ElasticSearch partial updates to add and remove acls on the fly? I want to be able to add an index and remove an index from a user/index ACL on the fly, without having to pull the whole document and push it back in.