From the webpage:
Wonderdog is a Hadoop interface to Elastic Search. While it is specifically intended for use with Apache Pig, it does include all the necessary Hadoop input and output formats for Elastic Search. That is, it’s possible to skip Pig entirely and write custom Hadoop jobs if you prefer.
I may just be paying more attention but the search scene seems to be really active.
That’s good for topic maps because the more data that is searched, the greater the likelihood of heterogeneous data. Text messages between teens are probably heterogeneous but who cares?
Medical researchers using different terminology results in heterogeneous data, not just today, but data from yesteryear. Now that could be important.