try (RankFusionProcessor processor = new RankFusionProcessor()) {
            processor.setSearcher(new TestSearcher(100));
            processor.register(new TestSearcher(0)); // Empty searcher
            processor.register(new TestSearcher(50)); // Half-full searcher
            processor.init();

        try (RankFusionProcessor processor = new RankFusionProcessor()) {
            processor.setSearcher(new TestSearcher(100));
            processor.register(new NullDocumentSearcher());
            processor.init();

            // Should handle null documents gracefully
            final List<Map<String, Object>> results = processor.search("*", new TestSearchRequestParams(0, 10, 0), OptionalThing.empty());

        final CountDownLatch endLatch = new CountDownLatch(numThreads);
        final AtomicInteger registeredCount = new AtomicInteger(0);

        try (RankFusionProcessor processor = new RankFusionProcessor()) {
            processor.setSearcher(new TestSearcher(100));
            processor.init();

            final ExecutorService executor = Executors.newFixedThreadPool(numThreads);
            try {
                for (int i = 0; i < numThreads; i++) {

        CurlRequest.RequestProcessor processor1 = new CurlRequest.RequestProcessor("UTF-8", 1024);
        CurlRequest.RequestProcessor processor2 = new CurlRequest.RequestProcessor("ISO-8859-1", 2048);
        CurlRequest.RequestProcessor processor3 = new CurlRequest.RequestProcessor("UTF-16", 512);

        assertNotNull(processor1.getResponse());
        assertNotNull(processor2.getResponse());

                    java.util.function.BiFunction<org.opensearch.action.update.UpdateRequestBuilder, org.opensearch.search.SearchHit, org.opensearch.action.update.UpdateRequestBuilder> processor) {
                // Return a fixed count for testing
                return 3L;
            }
        };
        ComponentUtil.register(mockSearchEngineClient, "searchEngineClient");

        // Mock FessConfig

   *     processor} throws an {@code IOException}
   * @since 16.0
   */
  @CanIgnoreReturnValue // some processors won't return a useful result
  @ParametricNullness
  public <T extends @Nullable Object> T readLines(LineProcessor<T> processor) throws IOException {
    checkNotNull(processor);

    Closer closer = Closer.create();
    try {

            return processedBytes;
          }
        };

    source.read(processor);
    assertTrue(source.wasStreamOpened() && source.wasStreamClosed());

    assertArrayEquals(bytes, processedBytes);
  }

  public void testRead_withProcessor_stopsOnFalse() throws IOException {
    ByteProcessor<@Nullable Void> processor =
        new ByteProcessor<@Nullable Void>() {
          boolean firstCall = true;

          }
        };

    File asciiFile = getTestFile("ascii.txt");
    byte[] result = Files.readBytes(asciiFile, processor);
    assertEquals(Bytes.asList(Files.toByteArray(asciiFile)), Bytes.asList(result));
  }

  public void testReadBytes_returnFalse() throws IOException {
    ByteProcessor<byte[]> processor =
        new ByteProcessor<byte[]>() {
          private final ByteArrayOutputStream out = new ByteArrayOutputStream();

   *
   * @param file the file to read
   * @param processor the object to which the bytes of the file are passed.
   * @return the result of the byte processor
   * @throws IOException if an I/O error occurs
   * @deprecated Prefer {@code asByteSource(file).read(processor)}.
   */
  @Deprecated
  @InlineMe(
      replacement = "Files.asByteSource(file).read(processor)",
      imports = "com.google.common.io.Files")

            return processedBytes;
          }
        };

    source.read(processor);
    assertTrue(source.wasStreamOpened() && source.wasStreamClosed());

    assertArrayEquals(bytes, processedBytes);
  }

  public void testRead_withProcessor_stopsOnFalse() throws IOException {
    ByteProcessor<@Nullable Void> processor =
        new ByteProcessor<@Nullable Void>() {
          boolean firstCall = true;