https://beam.apache.org/releases/javadoc/2.71.0/org/apache/beam/runners/flink/translation/wrappers/streaming/io/source/FlinkSource.TimestampExtractor.html
FlinkSource.TimestampExtractor (Apache Beam 2.71.0)
declaration: package: org.apache.beam.runners.flink.translation.wrappers.streaming.io.source, class: FlinkSource, interface: TimestampExtractor
apache beam