in flink-connector-opensearch/src/main/java/org/apache/flink/streaming/connectors/opensearch/OpensearchSink.java [486:496]
private void configureBulkSize(BulkProcessor.Builder bulkProcessorBuilder) {
final ByteSizeUnit sizeUnit;
if (bulkProcessorFlushMaxSizeMb == -1) {
// bulk size can be disabled with -1, however the ByteSizeValue constructor accepts -1
// only with BYTES as the size unit
sizeUnit = ByteSizeUnit.BYTES;
} else {
sizeUnit = ByteSizeUnit.MB;
}
bulkProcessorBuilder.setBulkSize(new ByteSizeValue(bulkProcessorFlushMaxSizeMb, sizeUnit));
}