override fun onEvent(
    id: String?,
    type: String?,
    data: String,
  ) {
    listener.onEvent(this, id, type, data)
  }

  override fun onRetryChange(timeMs: Long) {
    // Ignored. We do not auto-retry.
  }

     * @param index              the index configuration name
     * @param indexName          the actual index name to create
     * @param numberOfShards     the number of primary shards
     * @param autoExpandReplicas the auto expand replicas setting
     * @param uploadConfig       whether to upload configuration files
     * @return true if the index was created successfully, false otherwise
     */