code: public void setIconAnchor(@Property.ICON_ANCHOR String value) {
      jsonObject.addProperty(SymbolOptions.PROPERTY_ICON_ANCHOR, value);
    }
docs: Set the IconAnchor property
  <p>
  Part of the icon placed closest to the anchor.
  </p>
  <p>
  To update the symbol on the map use {@link SymbolManager#update(Annotation)}.
  <p>
  
  @param value constant property value for String