code: @Deprecated
      public MutateInBuilder counter(String path, long delta, boolean createPath) {
          asyncBuilder.counter(path, delta, new SubdocOptionsBuilder().createPath(createPath));
          return this;
      }
docs: Increment/decrement a numerical fragment in a JSON document.
  If the value (last element of the path) doesn't exist the counter is created and takes the value of the delta.
  
  @param path the path to the counter (must be containing a number).
  @param delta the value to increment or decrement the counter by.
  @param createPath true to create missing intermediary nodes.