docs: public List<Similarity> similar(Image object, double threshold) {
          //return getDatastore().find(Similarity.class).field("firstObject").equal(object).order("similarityScore").asList();
          Query<Similarity> q = getDatastore().createQuery(Similarity.class);
          q.or(
                  q.criteria("firstObject").equal(object),
                  q.criteria("secondObject").equal(object)
          );
          return q.order("-similarityScore").filter("similarityScore >", threshold).asList();
      }