Clark Boylan a57925c9ed Upgrade elasticsearch to 1.7.6
This can be done as a rolling upgrade as we are currently running 1.7.5
which shares a majory version with 1.7.6.

Change-Id: Icd759967dc8a6a09d4db0a78d2dfef72042c171e
2017-01-03 14:46:54 -08:00
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