code: public void addFields(Document document, DecoratedKey partitionKey, CellName clusteringKey) {
          ByteBuffer fullKey = byteBuffer(partitionKey, clusteringKey);
          Field field = new StringField(FIELD_NAME, ByteBufferUtils.toString(fullKey), Store.NO);
          document.add(field);
      }
docs: Adds to the specified Lucene {@link Document} the full row key formed by the specified partition key and the
  clustering key.
  
  @param document      A Lucene {@link Document}.
  @param partitionKey  A partition key.
  @param clusteringKey A clustering key.