final Map<String, MappingMetadata> indexMappings = getMappingsResponse.mappings();
        final MappingMetadata mappingMetadata = indexMappings != null ? indexMappings.get(index) : null;
        if (mappingMetadata == null || mappingMetadata.sourceAsMap().isEmpty()) {
            final AcknowledgedResponse putMappingResponse = fesenClient.get(c -> {

  public UnmodifiableListIterator<E> listIterator(int index) {
    return new AbstractIndexedListIterator<E>(size(), index) {
      @Override
      protected E get(int index) {
        return ImmutableList.this.get(index);
      }
    };
  }

  @Override
  public void forEach(Consumer<? super E> consumer) {
    checkNotNull(consumer);
    int n = size();
    for (int i = 0; i < n; i++) {

    @Override
    public int size() {
      return parent.length();
    }

    @Override
    public Long get(int index) {
      return parent.get(index);
    }

    @Override
    public boolean contains(@Nullable Object target) {
      return indexOf(target) >= 0;
    }

    @Override
    public int indexOf(@Nullable Object target) {

      @Override
      public int size() {
        return max(0, data.size() + delta);
      }

      @Override
      public T get(int index) {
        return data.get(index);
      }

      @Override
      public T set(int index, T element) {
        return data.set(index, element);
      }

      @Override
      public boolean add(T element) {

            // Select channel based on affinity key
            List<ChannelInfo> list = new ArrayList<>(channels);
            int index = Math.abs((int)(affinityKey % list.size()));
            return list.get(index);
        }
        
        // No affinity, use weighted random
        return selectWeightedRandom(channels);
    }
    

    @Override
    public int size() {
      return parent.length();
    }

    @Override
    public Double get(int index) {
      return parent.get(index);
    }

    @Override
    public boolean contains(@Nullable Object target) {
      return indexOf(target) >= 0;
    }

    @Override
    public int indexOf(@Nullable Object target) {

    @Override
    public int size() {
      return parent.length();
    }

    @Override
    public Integer get(int index) {
      return parent.get(index);
    }

    @Override
    public boolean contains(@Nullable Object target) {
      return indexOf(target) >= 0;
    }

    @Override
    public int indexOf(@Nullable Object target) {

        if (getHeader() == null && layout.isEmpty()) {
            // This is the first comment. Search for blank lines.
            int index = commentLines.size() - 1;
            while (index >= 0 && !commentLines.get(index).isEmpty()) {
                index--;
            }
            setHeader(new ArrayList<String>(commentLines.subList(0, index + 1)));
            return index + 1;
        } else {
            return 0;

        if (getHeader() == null && layout.isEmpty()) {
            // This is the first comment. Search for blank lines.
            int index = commentLines.size() - 1;
            while (index >= 0 && !commentLines.get(index).isEmpty()) {
                index--;
            }
            setHeader(new ArrayList<String>(commentLines.subList(0, index + 1)));
            return index + 1;
        } else {
            return 0;

    }

    @Override
    ImmutableList<E> createAsList() {
      return new ImmutableAsList<E>() {
        @Override
        public E get(int index) {
          return Indexed.this.get(index);
        }

        @Override
        Indexed<E> delegateCollection() {
          return Indexed.this;
        }

        // redeclare to help optimizers with b/310253115