docs: public void splitField(String sourceField, String targetField, String splitString, String index) {
          TransformationStep step = new TransformationStep();
          step.setTargetField(targetField);
          step.setSourceFields(sourceField);
          step.setOperationParameter(TransformationConstants.SPLIT_PARAM, splitString);
          step.setOperationParameter(TransformationConstants.INDEX_PARAM, index);
          step.setOperationName("split");
          steps.add(step);
      }