the S4 paper "S4: Distributed Stream Computing Platform" from 2010 mentioned that there are some prepared PEs for standard tasks:

"Several PEs are available for standard tasks such as count, aggregate, join, and so on."

However, I merely found the AbstractSlidingWindowPE and didn't find the mentioned PEs for counting, aggregating and so on...

Are they still available in S4 0.6?

Thanks in advance.

Best, Martin