final List<Map<String, Object>> documents = new ArrayList<>();
        final Map<String, Object> doc1 = new HashMap<>();
        doc1.put("title", "Doc 1");
        doc1.put("content", "<h1>Title</h1><p>Content 1</p>");
        documents.add(doc1);

        final Map<String, Object> doc2 = new HashMap<>();
        doc2.put("title", "Doc 2");

     */
    @Test
    public void test_duplicateDocumentIds() throws Exception {
        try (RankFusionProcessor processor = new RankFusionProcessor()) {
            processor.setSearcher(new TestSearcherWithFixedIds("doc1", "doc2", "doc3"));
            processor.register(new TestSearcherWithFixedIds("doc2", "doc3", "doc4")); // Some duplicates
            processor.init();

- Metadata (title, author, date, etc.)
- Security/access control information

**Step 2: Format for Fess**

Create NDJSON file with required Fess fields:

```json
{"url":"http://example.com/doc1","title":"Document 1","content":"Full text content...","mimetype":"text/html"}
{"url":"http://example.com/doc2","title":"Document 2","content":"More content...","mimetype":"application/pdf"}
```

**Step 3: Bulk Import**