code: @Override
      public final SubmitterDocument findByFileAndString(
              final String filename, final String string) {
          final Query searchQuery = new Query(Criteria.where("string").is(string)
                  .and("filename").is(filename));
          final SubmitterDocument submitterDocument =
                  mongoTemplate.findOne(searchQuery,
                          SubmitterDocumentMongo.class);
          if (submitterDocument == null) {
              return null;
          }
          final Submitter submitter = (Submitter) toObjConverter.createGedObject(
                  null, submitterDocument);
          submitterDocument.setGedObject(submitter);
          return submitterDocument;
      }
docs: {@inheritDoc}