@Override
    public void initializeState(FunctionInitializationContext context) throws Exception {
        // no initialization needed
    }
Disable flushing on checkpoint. When disabled, the sink will not wait for all pending action
requests to be acknowledged by Elasticsearch on checkpoints.

<p>NOTE: If flushing on checkpoint is disabled, the Flink Elasticsearch Sink does NOT provide
any strong guarantees for at-least-once delivery of action requests.
inlong-sort/sort-flink/sort-flink-v1.15/sort-connectors/elasticsearch-base/src/main/java/org/apache/inlong/sort/elasticsearch/ElasticsearchSinkBase.java