Commits on Feb 4, 2019

1. Fix IndexAuditTrail rolling upgrade on rollover edge 2 (elastic#38286) …

   Fixes a race during the rolling upgrade with the index audit output enabled.
   
   The race is that after the upgraded node is restarted, it installs the audit template
   and updates the mapping of the "current" (from his perspective) audit index. But
   the template might be installed after a new daily rolled-over index has been
   created by the other old nodes, using the old templates.
   
   However, the new node, even if it installs the template after the rollover edge,
   can accumulate audit events before the edge, and will correctly try to update the
   mapping of the audit index before the edge. But this way, the mapping of the index
   after the edge remains un-updated, because only the master node does the
   mapping updates.
   
   The fix keeps the design of only allowing the master to update the mapping, but
   the master will try, on a best effort policy, to also possibly update the mapping of
   the next rollover audit index.

   

   albertzaharovits committed Feb 4, 2019
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