[polyfractal]

Just FYI, multicast discovery was moved to a plugin in v2.0 [1], deprecated in v2.2 [2] and removed entirely in v5.0 [3]

- [1] https://www.elastic.co/guide/en/elasticsearch/reference/2.0/...

- [2] https://www.elastic.co/guide/en/elasticsearch/plugins/2.2/di...

- [3] https://www.elastic.co/guide/en/elasticsearch/plugins/5.1/di...