metaDataMap.put(key, values);

                // meta -> content
                if (fessConfig.isCrawlerMetadataContentIncluded(key)) {
                    final String joinedValue = StringUtils.join(values, ' ');
                    if (StringUtil.isNotBlank(joinedValue)) {
                        if (contentMetaBuf.length() > 0) {
                            contentMetaBuf.append(' ');
                        }

   * {@code joiner}.
   *
   * <p><b>{@code Stream} equivalent:</b> {@code joiner.join(stream.iterator())}, or, if you are not
   * using any optional {@code Joiner} features, {@code
   * stream.collect(Collectors.joining(delimiter)}.
   *
   * @since 18.0
   */
  public final String join(Joiner joiner) {
    return joiner.join(this);
  }

  /**

   * {@code joiner}.
   *
   * <p><b>{@code Stream} equivalent:</b> {@code joiner.join(stream.iterator())}, or, if you are not
   * using any optional {@code Joiner} features, {@code
   * stream.collect(Collectors.joining(delimiter)}.
   *
   * @since 18.0
   */
  public final String join(Joiner joiner) {
    return joiner.join(this);
  }

  /**

* `--feature-gates` argument has been removed from the `kubeadm join` command. Feature gates will be retrieved from the cluster configuration during the join process. ([#70755](https://github.com/kubernetes/kubernetes/pull/70755), [@ereslibre](https://github.com/ereslibre))

                results[index] = thumbnailGenerator.generate(thumbnailId, outputFile);
            });
            threads[i].start();
        }

        for (Thread thread : threads) {
            thread.join();
        }

        for (boolean result : results) {
            assertTrue(result);
        }
    }

    /**
     * Test implementation of ThumbnailGenerator interface
     */

         * Interrupted exceptions are caught and logged at debug level.
         */
        public void awaitTermination() {
            try {
                join();
            } catch (final InterruptedException e) {
                if (logger.isDebugEnabled()) {
                    logger.debug("Interrupted.", e);
                }
            }
        }

            }
            this.thread = null;
        }
        t.interrupt();
        if (logger.isDebugEnabled()) {
            logger.debug("TimeoutManager stopped.");
        }
        t.join(timeoutMillis);
        return !t.isAlive();
    }

    /**
     * Clears the managed {@link TimeoutTask}.
     */
    public synchronized void clear() {
        timeoutTaskList.clear();
    }

    queue.takeSuccessfully();
    assertInterrupted();
  }

  // join() tests
  public void testJoinWithNoWait() throws InterruptedException {
    Stopwatch stopwatch = Stopwatch.createStarted();
    Thread thread = new Thread(new JoinTarget(15));
    thread.start();
    thread.join();
    assertFalse(thread.isAlive());

    joinUninterruptibly(thread);

        start = System.currentTimeMillis();
        helper.checkCrawlerStatus();
        end = System.currentTimeMillis();
        assertTrue(end - start >= 100); // Should wait until crawler is running
        thread.join();
    }

    public void test_delayByRules() throws ParseException {
        IntervalControlHelper helper = createHelper("12:15", 1);

        // Test with no rules

            final InputStreamThread it = jobProcess.getInputStreamThread();
            it.start();

            final Process currentProcess = jobProcess.getProcess();
            currentProcess.waitFor();
            it.join(5000);

            final int exitValue = currentProcess.exitValue();

            if (logger.isInfoEnabled()) {
                logger.info("Python: Exit Code={} - Process Output:\n{}", exitValue, it.getOutput());