source.put(FieldNames.USER_BOOST, 2.0f);
        source.put(FieldNames.READING_PREFIX + "0", Arrays.asList("reading1", "reading2"));
        source.put(FieldNames.READING_PREFIX + "1", Arrays.asList("reading3"));
        source.put(FieldNames.FIELDS, Arrays.asList("field1"));
        source.put(FieldNames.TAGS, Arrays.asList("tag1", "tag2"));
        source.put(FieldNames.ROLES, Arrays.asList("user"));

        // Test constructor with both null tags and roles
        String word = "test word";
        float boost = 3.0f;
        List<String> readings = Arrays.asList("reading1", "reading2", "reading3");
        List<String> fields = Arrays.asList("field1", "field2");
        List<String> tags = null;
        List<String> roles = null;