apply review comments to better handle logging messages

  }

  /**

   * Return the expected index name for a given topic. It makes sure to lowercase the topic name

   * as elasticsearch require all index names to be lowercase.

   * See https://github.com/confluentinc/kafka-connect-elasticsearch/issues/246 for connector details.

   * See https://github.com/elastic/elasticsearch/issues/29420 for elasticsearch details.

   * @param topic The topic name being proceed.

   * @return String A valid elasticsearch index name

   * Return the expected index name for a given topic, using the configured mapping or the topic name. Elasticsearch

   * <a href="https://github.com/elastic/elasticsearch/issues/29420">accepts only lowercase index names</a>.

   */

  private String convertTopicToIndexName(String topic) {

    final String indexOverride = topicToIndexMap.get(topic);

    String index = indexOverride != null ? indexOverride : topic.toLowerCase();

    log.debug("Topic " + topic + " was translated as index name " + index);

    log.debug("Topic '{}' was translated as index '{}'", topic, index);

    return index;

  }