assertTrue(bulkLine.contains("reading1"));
        assertTrue(bulkLine.contains("reading2"));
    }

    @Test(expected = SuggesterException.class)
    public void testCreateBulkLineWithNullItem() {
        // Test that null item causes exception
        SuggestUtil.createBulkLine("test_index", "_doc", null);
    }

    @Test
    public void testCreateDefaultReadingConverter() {