Examples use deprecated method of writeAsText

The DataStream examples at https://github.com/apache/flink/tree/master/flink-examples/flink-examples-streaming/src/main/java/org/apache/flink/streaming/examples uses

DataStream#writeAsText() which has been deprecated.

The associated deprecated calls to example code are distributed as follows:

• org/apache/flink/streaming/examples/wordcount/WordCount.java
• org/apache/flink/streaming/examples/windowing/WindowWordCount.java
• org/apache/flink/streaming/examples/windowing/SessionWindowing.java
• org/apache/flink/streaming/examples/twitter/TwitterExample.java
• org/apache/flink/streaming/examples/sideoutput/SideOutputExample.java
• org/apache/flink/streaming/examples/iteration/IterateExample.java

According to the code description, this API call should be replaced by the addSink API.

I feel that the project example code should not use deprecated APIs, which could be misleading to the reference, and should keep the API usage examples up to date.