code: @Deprecated
    public void setPrimaryKeys(String... primaryKeyFieldName) {
      setProp(ConfigurationKeys.EXTRACT_PRIMARY_KEY_FIELDS_KEY, Joiner.on(",").join(primaryKeyFieldName));
    }
docs: Set primary keys.
  
  <p>
  The order of primary keys does not matter.
  </p>
  
  @param primaryKeyFieldName primary key names
  @deprecated It is recommended to set primary keys in {@code WorkUnit} instead of {@code Extract}.