code: @Override
      public PersonDocument findByFileAndString(final String filename,
              final String string) {
          final Query searchQuery = new Query(Criteria.where("string").is(string)
                  .and("filename").is(filename));
          final PersonDocument personDocument = mongoTemplate.findOne(
                  searchQuery, PersonDocumentMongo.class);
          if (personDocument == null) {
              return null;
          }
          final Person person =
                  (Person) toObjConverter.createGedObject(null, personDocument);
          personDocument.setGedObject(person);
          return personDocument;
      }
docs: {@inheritDoc}