in flink-connector-opensearch/src/main/java/org/apache/flink/streaming/connectors/opensearch/OpensearchSink.java [678:685]
public void setBulkFlushMaxSizeMb(int maxSizeMb) {
Preconditions.checkArgument(
maxSizeMb == -1 || maxSizeMb > 0,
"Max size of buffered actions must be larger than 0.");
this.bulkRequestsConfig.put(
CONFIG_KEY_BULK_FLUSH_MAX_SIZE_MB, String.valueOf(maxSizeMb));
}