code: protected void removeUnmappedFields(JdbcIndex<?> index) {
          Iterator<IndexField<?>> iterator = index.getFields().iterator();
  
          while (iterator.hasNext()) {
              IndexField<?> field = iterator.next();
  
              if (field.getMappedType() == null) {
                  LOG.info("Removing {} from index {} - no mapped type information", field.getName(), index.getName());
                  iterator.remove();
              }
          }
  
      }
docs: Remove fields from the index that have no mapped type information.
  
  @param index the index to be pruned