Fix pipeline agg serialization for ccs (backport of #54282) #54468
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This fixes pipeline aggregations used in cross cluster search from an older version of Elasticsearch to a newer version of Elasticsearch. I broke this in elastic#53730 when I was too aggressive in shutting off serialization of pipeline aggs. In particular, this comes up when the coordinating node is pre-7.8.0 and the gateway node is on or after 7.8.0. The fix is another step down the line to remove pipeline aggregators from the aggregation tree. Sort of. It create a new `List<PipelineAggregator>` member in `InternalAggregation` *but* it is only used for bwc serialization and it is fed by the mechanism established in elastic#53730 to read the pipelines from the
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…4282) (elastic#54468)" This reverts commit a5adac0. It causes some bwc tests to fail.
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This fixes pipeline aggregations used in cross cluster search from an older
version of Elasticsearch to a newer version of Elasticsearch. I broke
this in #53730 when I was too aggressive in shutting off serialization
of pipeline aggs. In particular, this comes up when the coordinating
node is pre-7.8.0 and the gateway node is on or after 7.8.0.
The fix is another step down the line to remove pipeline aggregators
from the aggregation tree. Sort of. It create a new
List<PipelineAggregator>member inInternalAggregationbut it isonly used for bwc serialization and it is fed by the mechanism
established in #53730 to read the pipelines from the