if (!first) {
                json.append(",\n");
            }
            first = false;

            json.append("  \"").append(escapeJson(field)).append("\": ");
            appendJsonValue(json, value);
        }

        json.append("\n}\n");
        return json.toString();
    }

    private void appendJsonValue(final StringBuilder json, final Object value) {

```bash
# Export Solr documents as JSON
curl "http://solr-server:8983/solr/collection1/select?q=*:*&rows=10000&wt=json" \
  -o solr-export.json
```

**Step 2: Transform to Fess Format**

Create a transformation script to map Solr fields to Fess fields:

```python
import json

# Load Solr export
with open('solr-export.json', 'r') as f:
    solr_data = json.load(f)

# Transform documents

        final String json = new JsonIndexExportFormatter().format(source, Collections.emptySet());

        assertTrue(json.contains("\"title\": \"Test Title\""));
        assertTrue(json.contains("\"content\": \"Test Content\""));
        assertTrue(json.contains("\"url\": \"https://example.com/page.html\""));
        assertTrue(json.startsWith("{"));
        assertTrue(json.trim().endsWith("}"));
    }

    @Test

    /**
     * Extracts a string value from JSON response using Jackson parser.
     *
     * @param json the JSON response
     * @param key the key to extract
     * @return the extracted string value
     */
    protected String extractJsonString(final String json, final String key) {
        try {
            final String cleanJson = stripCodeFences(json);

     * as {@code jobLogId}. When job logging is disabled, {@code jobLogId} is {@code null}.
     *
     * @param id the ID of the scheduled job to start
     * @return JSON response with {@code jobLogId} (nullable) and status
     */
    // PUT /api/admin/scheduler/{id}/start
    @Execute(urlPattern = "{}/@word")
    public JsonResponse<ApiResult> put$start(final String id) {

        headers.put("CONTENT-LENGTH", Arrays.asList("100"));
        headers.put("accept-encoding", Arrays.asList("gzip"));
        response.setHeaders(headers);

        // All header access should be case-insensitive
        assertEquals("application/json", response.getHeaderValue("content-type"));
        assertEquals("application/json", response.getHeaderValue("CONTENT-TYPE"));

        if (testToken != null) {
            return;
        }
        given().contentType("application/json").delete(getEsUrl() + "/fess_config.access_token/_doc/" + DEFAULT_TEST_TOKEN_ID);
    }

    public static void refresh() {
        given().contentType("application/json").post(getEsUrl() + "/_refresh");
    }

    public static String getFessUrl() {

     * Returns list of path mapping settings.
     * Supports both GET and PUT requests for retrieving paginated path mapping configurations.
     *
     * @param body search parameters for filtering and pagination
     * @return JSON response containing path mapping settings list with pagination info
     */
    @Execute
    public JsonResponse<ApiResult> settings(final SearchBody body) {
        validateApi(body, messages -> {});

     * Supports both GET and PUT requests for retrieving paginated related content configurations.
     *
     * @param body search parameters for filtering and pagination
     * @return JSON response containing related content settings list with pagination info
     */
    @Execute
    public JsonResponse<ApiResult> settings(final SearchBody body) {
        validateApi(body, messages -> {});

    /**
     * Retrieves web configuration settings with pagination.
     *
     * @param body the search parameters for filtering and pagination
     * @return JSON response containing web configuration settings list
     */
    // GET /api/admin/webconfig/settings
    // PUT /api/admin/webconfig/settings
    @Execute
    public JsonResponse<ApiResult> settings(final SearchBody body) {