Commits on Dec 16, 2019

1. Migrate peer recovery from translog to retention lease (elastic#49448) …

   Since 7.4, we switch from translog to Lucene as the source of history
   for peer recoveries. However, we reduce the likelihood of
   operation-based recoveries when performing a full cluster restart from
   pre-7.4 because existing copies do not have PPRL.
   
   To remedy this issue, we fallback using translog in peer recoveries if
   the recovering replica does not have a peer recovery retention lease,
   and the replication group hasn't fully migrated to PRRL.
   
   Relates elastic#45136

   

   dnhatn committed Dec 16, 2019
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