public static NearestNeighbor nearestNeighbor(String docVectorName, String queryVectorName) {
        return new NearestNeighbor(docVectorName, queryVectorName);
    }
@Test
    void nearestNeighbor() {
        String q = Q.p("f1").nearestNeighbor("query_vector")
                .build();

        assertEquals(q, "yql=select * from sources * where nearestNeighbor(f1, query_vector)");
    }