@Test
 public void testJsonSerializationNumbers() {
   ContainsConditionBuilder builder = new ContainsConditionBuilder("field", 1, 2, -3).boost(0.7);
   testJsonSerialization(builder, "{type:\"contains\",field:\"field\",values:[1,2,-3],boost:0.7}");
 }
 @Test
 public void testJsonSerializationStrings() {
   ContainsConditionBuilder builder = new ContainsConditionBuilder("field", "a", "b").boost(0.7);
   testJsonSerialization(
       builder, "{type:\"contains\",field:\"field\",values:[\"a\",\"b\"],boost:0.7}");
 }