* Check their implementations for details.
*/
topology
.newStream("tweets", spout)
.each(new Fields("str"), new ParseTweet(), new Fields("text", "content", "user"))
.each(new Fields("text", "content"), new TweetIdExtractor(), new Fields("tweetId"))
.project(new Fields("tweetId", "text"))
.each(new Fields("tweetId", "text"), new Print())
.partitionPersist(new ElasticSearchStateFactory(), new Fields("tweetId", "text"), new ElasticSearchStateUpdater());
/**