String nestedKey = key + "." + nestedEntry.getKey();
                            Object nestedValue = nestedEntry.getValue();
                            if (nestedValue instanceof Map) {
                                Map<String, Object> deepMap = (Map<String, Object>) nestedValue;
                                for (Map.Entry<String, Object> deepEntry : deepMap.entrySet()) {

        Map<String, Object> nestedMap = new HashMap<>();
        nestedMap.put("nestedKey", "nestedValue");
        doc.put("nested", nestedMap);

        List<Map<String, Object>> listOfMaps = new ArrayList<>();
        listOfMaps.add(nestedMap);
        doc.put("listOfMaps", listOfMaps);

        assertEquals("nestedValue", DocumentUtil.getValue(nestedMap, "nestedKey", String.class));

        source.put("TestKey", "value1");
        source.put("AnotherTestKey", "value2");

        Map<String, Object> nested = new HashMap<>();
        nested.put("NestedKey", "nestedValue");
        source.put("NestedMap", nested);

        Map<String, Object> result = searchLogHelper.toLowerHyphen(source);

        assertEquals("value1", result.get("test_key"));

        TestSearchLogEvent event = new TestSearchLogEvent("complex-id", 1L, "complex");

        // Create nested map structure
        Map<String, Object> nestedMap = new HashMap<>();
        nestedMap.put("nested_key", "nested_value");

        Map<String, Object> sourceMap = new HashMap<>();
        sourceMap.put("string", "test");
        sourceMap.put("integer", 42);
        sourceMap.put("long", 100L);