code: 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);
      }
docs: Adds a split transformation step to the transformation description. The value of the source field is split based
  on the split string into parts. Based on the given index, the result will be set to the target field. The index
  needs to be an integer value. All fields need to be of the type String.