public org.apache.flink.table.descriptors.Elasticsearch bulkFlushBackoffExponential() {
		internalProperties.putString(
			CONNECTOR_BULK_FLUSH_BACKOFF_TYPE,
			ElasticsearchValidator.CONNECTOR_BULK_FLUSH_BACKOFF_TYPE_VALUE_EXPONENTIAL);
		return this;
	}
Configures how to buffer elements before sending them in bulk to the cluster for efficiency.

<p>Sets an exponential backoff type to use when flushing bulk requests.
elasticsearch5-xh/elasticsearch5-xh-sink/src/main/java/org/apache/flink/table/descriptors/Elasticsearch.java