update word count to use the new dag.newVertex() API
update word count to use the new dag.newVertex() API

viliam-durina/hazelcast-jet-code-samples,mtopolnik/hazelcast-jet-code-samples,viliam-durina/hazelcast-jet-code-samples,mtopolnik/hazelcast-jet-code-samples,mtopolnik/hazelcast-jet-code-samples