Segments API: Add version & compound for each segment
closes #2823
Merge branch 'master' of git://github.com/elasticsearch/elasticsearch
Merge commit 'b1e2263def720d7e1f04c3f5ecdc82b2034c428b'

# By Shay Banon
# Via Marco Simons (1) and Shay Banon (1)
* commit 'b1e2263def720d7e1f04c3f5ecdc82b2034c428b':
  Segments API: Add version & compound for each segment closes #2823