S3 Source support in Flink

[Abhishek SP]

Hello,

I see S3 supported as a Sink through StreamingFileSink
<https://ci.apache.org/projects/flink/flink-docs-master/docs/connectors/datastream/streamfile_sink/>
but
do not see a source equivalent StreamingFileSource

*Questions:*
1. What is the current recommendation for using S3 as a continuous source
for Flink Streaming Application?
2. If we have to implement a custom S3 continuous source, how would one
implement the SplitEnumerator since ListObjects S3 API can become expensive
as the bucket grows?

Thanks in advance

Best,
Abhishek