Update to elasticsearch 5.2.0
Update to elasticsearch 5.2.0

Closes #296.

dadoonet/fscrawler,dadoonet/fsriver,dadoonet/fsriver,kneubi/fscrawler,dadoonet/fsriver,kneubi/fscrawler,dadoonet/fscrawler,dadoonet/fscrawler,kneubi/fscrawler