49f365ddfd
In #54716 I removed pipeline aggregators from the aggregation result tree and caused us to read them from the request. This saves a bunch of round trip bytes, which is neat. But there was a bug in the backwards compatibility logic. You see, we still have to give the pipeline aggregations to nodes older than 7.8 over the wire because that is how they know what pipelines to run. They have the pipelines in the request but they don't read them. They use the ones in the response tree. Anyway, we had a bug where we were never sending pipelines defined two levels down. So while you are upgrading the pipeline wouldn't run. Sometimes. If the data node of the "first" result was post-7.8 and the coordinating node was pre-7.8. This fixes the bug. |
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