// Test max version
        event.setVersionNo(Long.MAX_VALUE);
        assertEquals(Long.valueOf(Long.MAX_VALUE), event.getVersionNo());
    }

    // Test toSource method
    @Test
    public void test_toSource() {
        // Test with data
        TestSearchLogEvent event = new TestSearchLogEvent("id", 1L, "search");
        Map<String, Object> sourceMap = new HashMap<>();
        sourceMap.put("key1", "value1");