code: @Override
      public final NoteDocument findByFileAndString(
              final String filename, final String string) {
          final Query searchQuery = new Query(Criteria.where("string").is(string)
                  .and("filename").is(filename));
          final NoteDocument noteDocument =
                  mongoTemplate.findOne(searchQuery, NoteDocumentMongo.class);
          if (noteDocument == null) {
              return null;
          }
          final Note note =
                  (Note) toObjConverter.createGedObject(null, noteDocument);
          noteDocument.setGedObject(note);
          return noteDocument;
      }
docs: {@inheritDoc}