final ChatMessage msg = ChatMessage.assistantMessage("Response text");
        final Map<String, Object> doc1 = new HashMap<>();
        doc1.put("title", "Installation Guide");
        doc1.put("url", "http://example.com/install");
        msg.addSource(new ChatSource(1, doc1));
        final Map<String, Object> doc2 = new HashMap<>();
        doc2.put("title", "Quick Start");

        SuggestItem[] items = new SuggestItem[3];

        // Document only
        String[][] readings1 = new String[1][];
        readings1[0] = new String[] { "doc1" };
        items[0] = new SuggestItem(new String[] { "ドキュメント1" }, readings1, new String[] { "content" }, 1, 0, -1, new String[] { "tag1" },

     */
    @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();

        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");

        }

        // Sort all documents by fused RRF score (descending)
        final var fusedDocs = documentsByIdMap.values()
                .stream()
                .sorted((doc1, doc2) -> Float.compare(toFloat(doc2.get(scoreField)), toFloat(doc1.get(scoreField))))
                .toList();

        // Calculate offset based on documents not in main searcher's top results
        int offset = 0;

- 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**