public void setBulkFlushBackoff(boolean enabled) {
            this.bulkRequestsConfig.put(
                    CONFIG_KEY_BULK_FLUSH_BACKOFF_ENABLE, String.valueOf(enabled));
        }
Sets whether or not to enable bulk flush backoff behaviour.

@param enabled whether or not to enable backoffs.
inlong-sort/sort-flink/sort-flink-v1.18/sort-connectors/elasticsearch7/src/main/java/org/apache/inlong/sort/elasticsearch7/ElasticsearchSink.java