java-util-stream Support for Hazelcast IMDG Word Count

The word count example that was described in the Quickstart - Word Count chapter can be rewritten using the java.util.stream API as follows:

IMap<String, Long> counts = lines
                .stream()
                .flatMap(m -> Stream.of(PATTERN.split(m.getValue().toLowerCase())))
                .collect(DistributedCollectors.toIMap(w -> w, w -> 1L, (left, right) -> left + right));