public org.apache.flink.table.descriptors.Elasticsearch bulkFlushBackoffDelay(long delay) {
		internalProperties.putLong(CONNECTOR_BULK_FLUSH_BACKOFF_DELAY, delay);
		return this;
	}
Configures how to buffer elements before sending them in bulk to the cluster for efficiency.

<p>Sets the amount of delay between each backoff attempt when flushing bulk requests (in milliseconds).

<p>Make sure to enable backoff by selecting a strategy ({@link #bulkFlushBackoffConstant()} or
{@link #bulkFlushBackoffExponential()}).

@param delay delay between each backoff attempt (in milliseconds).
elasticsearch5-xh/elasticsearch5-xh-sink/src/main/java/org/apache/flink/table/descriptors/Elasticsearch.java