public org.apache.flink.table.descriptors.Elasticsearch bulkFlushMaxSize(String maxSize) {
		internalProperties.putMemorySize(CONNECTOR_BULK_FLUSH_MAX_SIZE, MemorySize.parse(maxSize, MemorySize.MemoryUnit.BYTES));
		return this;
	}
Configures how to buffer elements before sending them in bulk to the cluster for efficiency.

<p>Sets the maximum size of buffered actions per bulk request (using the syntax of {@link MemorySize}).
elasticsearch5-xh/elasticsearch5-xh-sink/src/main/java/org/apache/flink/table/descriptors/Elasticsearch.java