}

    @Override
    public @Nullable V replace(K key, V value) {
      throw new UnsupportedOperationException();
    }

    @Override
    public V computeIfAbsent(
        K key, java.util.function.Function<? super K, ? extends V> mappingFunction) {
      throw new UnsupportedOperationException();
    }

    @Override
    public @Nullable V computeIfPresent(

    Cache<Object, Object> cache =
        CacheBuilder.newBuilder().removalListener(removalListener).build();
    cache.put("a", "b");
    cache.asMap().computeIfAbsent("a", k -> "c");
    assertThat(notifications).isEmpty();
  }

  public void testCopyEntry_computing() {
    CountDownLatch startSignal = new CountDownLatch(1);

    checkNotNull(key);
    checkNotNull(function);
    int hash = hash(key);
    return segmentFor(hash).compute(key, hash, function);
  }

  @Override
  public V computeIfAbsent(K key, Function<? super K, ? extends V> function) {
    checkNotNull(key);
    checkNotNull(function);
    return compute(key, (k, oldValue) -> (oldValue == null) ? function.apply(key) : oldValue);
  }

     *
     * @param index the index name
     * @param path  path to the configuration file
     */
    public void addConfigFile(final String index, final String path) {
        configListMap.computeIfAbsent(index, k -> new ArrayList<>()).add(path);
    }

    /**
     * Sets the configuration settings for the search engine.
     *
     * @param settings map of configuration key-value pairs
     */