code: public String toCreateIndexDDL(final String indexName, final String indexType) {
      final StringBuilder ddl = new StringBuilder("create index ");
      ddl.append(indexName).append(' ').append(indexType).append(' ');
      ddl.append("runtime ").append(serializer.getId());
      return ddl.toString();
    }
docs: {@inheritDoc}
  
  @param indexName
  @param indexType