[Sample Project in Java]({{ site.baseurl }}/quickstart/java_api_quickstart.html) and [Sample Project in Scala]({{ site.baseurl }}/quickstart/scala_api_quickstart.html) are guides to setting up Maven and SBT projects and include simple implementations of a word count application.
Building real-time dashboard applications with Apache Flink, Elasticsearch, and Kibana is a blog post at elastic.co showing how to build a real-time dashboard solution for streaming data analytics using Apache Flink, Elasticsearch, and Kibana.
The Flink training website from data Artisans has a number of examples. See the hands-on sections, and the exercises.
The Flink sources include a number of examples for both streaming ( java / scala ) and batch ( java / scala ). These [stream instructions]({{ site.baseurl }}/dev/stream/examples.html#running-an-example) and [batch instructions]({{ site.baseurl }}/dev/batch/examples.html#running-an-example) explain how to run the examples.