@Override
            public XContentBuilder toXContent(XContentBuilder builder, Params params) throws IOException {
                // This may cause IOException due to OpenSearch XContent complexity
                builder.startObject();
                builder.field("string", "test");
                builder.endObject();
                return builder;
            }
        };

        try {

lement) {\n    let parent\n    const selector = Util.getSelectorFromElement(element)\n\n    if (selector) {\n      parent = document.querySelector(selector)\n    }\n\n    return parent || element.parentNode\n  }\n\n  // eslint-disable-next-line complexity\n  static _dataApiKeydownHandler(event) {\n    // If not input/textarea:\n    //  - And not a key in REGEXP_KEYDOWN => not a dropdown command\n    // If input/textarea:\n    //  - If space key => not a dropdown command\n    //  - If key is other...

        Map<String, String> complexObject = new HashMap<>();
        complexObject.put("nested", "value");

        dataStoreParams.put("complexKey", complexObject);
        assertEquals(complexObject, dataStoreParams.get("complexKey"));

        String asString = dataStoreParams.getAsString("complexKey");
        assertNotNull(asString);
        assertTrue(asString.contains("nested"));
    }

    // Test overwriting existing values