Spring Data ES Repository Method

Current Spring Data ES (1.3.2) does not support delete a child entity with "routing" set as "required". So has to use native client to do the deletion.

In child entity, the "@Parent" annotation must place at the right place for Spring Data ES repository method to save child entity correctly with "parent" and "routing" information.

Cast a child list to parent

List<? extends Base> baseList = subList;