code: @Deprecated
      public void setMode(Mode newMode) {
          mode = newMode;
          norm2 = mode.getNormalizer2(options);
      }
docs: Set the normalization mode for this object.
  <p>
  <b>Note:</b>If the normalization mode is changed while iterating
  over a string, calls to {@link #next} and {@link #previous} may
  return previously buffers characters in the old normalization mode
  until the iteration is able to re-sync at the next base character.
  It is safest to call {@link #setText setText()}, {@link #first},
  {@link #last}, etc. after calling <tt>setMode</tt>.
  <p>
  @param newMode the new mode for this <tt>Normalizer</tt>.
  The supported modes are:
  <ul>
  <li>{@link #NFC}    - Unicode canonical decompositiion
  followed by canonical composition.
  <li>{@link #NFKC}   - Unicode compatibility decompositiion
  follwed by canonical composition.
  <li>{@link #NFD}    - Unicode canonical decomposition
  <li>{@link #NFKD}   - Unicode compatibility decomposition.
  <li>{@link #NONE}   - Do nothing but return characters
  from the underlying input text.
  </ul>
  
  @see #getMode
  @deprecated ICU 56
  @hide original deprecated declaration