We are upgrading to 2.1 and reindexing all the data from scratch, when growing or shrinking the cluster it takes hours to relocate or recover a shard. On the 1.7.1 cluster it usually took a few minute for a small shard, same sized shard took almost an hour to recover on 2.1. Most of the time is spent recovering translog, I tried tuning indices.recovery.translog_size it did not help.
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