flink-connector-elasticsearch6/src/main/java/org/apache/flink/connector/elasticsearch/sink/Elasticsearch6SinkBuilder.java
flink-connector-elasticsearch7/src/main/java/org/apache/flink/connector/elasticsearch/sink/Elasticsearch7SinkBuilder.java

flink-connector-elasticsearch6/src/main/java/org/apache/flink/connector/elasticsearch/Elasticsearch6ApiCallBridge.java
flink-connector-elasticsearch7/src/main/java/org/apache/flink/connector/elasticsearch/Elasticsearch7ApiCallBridge.java