code: @Deprecated
      public void setIndexOnly(int index) {
          text.setIndex(index);  // validates index
          currentIndex=nextIndex=index;
          clearBuffer();
      }
docs: Set the iteration position in the input text that is being normalized,
  without any immediate normalization.
  After setIndexOnly(), getIndex() will return the same index that is
  specified here.
  
  @param index the desired index in the input text.
  @deprecated ICU 56
  @hide original deprecated declaration