assertEquals("id", fessConfig.getIndexFieldId());
    }

    public void test_indexFieldVersion() {
        assertEquals("_version", fessConfig.getIndexFieldVersion());
    }

    public void test_indexFieldSeqNo() {
        assertEquals("_seq_no", fessConfig.getIndexFieldSeqNo());
    }

    public void test_indexFieldPrimaryTerm() {
        assertEquals("_primary_term", fessConfig.getIndexFieldPrimaryTerm());
    }