springdata mongo repository method to return specific document property list - spring-data

Question

using spring data for mongodb, how do I specify the return type of the repository method to include a particular property from the document?
Ex:
#Document (collection = "foo")
class Foo {
String id
String name
... many more attributes
}
repository:
interface FooRepository extends MongoRepository<Foo, String> {
#Query { value = "{}", fields = "{'name' : 1}" }
List<String> findAllNames()
}
Above findAllNames works as expected and fetches only name property from the document. However spring data returned object is a string representation of Foo object which has id and name properties with values and remaining attributes as null.
Instead of Foo objects, I need to fetch List<String> which represents names.

Answer 1

As of now, I used a custom interface to achieve this. Moved the findAllNames() method from Spring data repository interface to my custom interface
interface FooRepositoryCustom {
List<String> findAllNames()
}
interface FooRepository extends MongoRepository<Foo, String>, FooRepositoryCustom {
}
#Component
class FooRepositoryImpl implements FooRepositoryCustom {
#Autowired
MongoOperations mongoOperations;
List<String> findAllNames() {
//using mongoOperations create the query and execute. Return the property values from document
}
}