This method was added to support x2sa code depended on spring-data 1.x with spring boot 2.x
Starting with spring data v2.x save(Iterable) was replaced by CrudRepository.saveAll(java.lang.Iterable<S>)
This is proxy CRUD repository that provides compatibility between spring-data 1.x and spring-data 2.x
Method org.springframework.data.repository.CrudRepository#save(java.lang.Iterable) was deleted spring-data version starting 2.x