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For the record, it's unlikely that the outages were caused due to differences between the versions so much as they were caused by the changing load patterns on the cluster and the old Java version.

Yea that, and they were testing on production like a boss.

> We did not sufficiently test the 0.20.2 release of elasticsearch on our infrastructure prior to rolling this upgrade out to our code search cluster, nor had we tested it on any other clusters beforehand.

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