Save memory when histogram agg is not on top (backport of #57277) #57377
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This saves some memory when the `histogram` aggregation is not a top level aggregation by dropping `asMultiBucketAggregator` in favor of natively implementing multi-bucket storage in the aggregator. For the most part this just uses the `LongKeyedBucketOrds` that we built the first time we did this.
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This saves some memory when the
histogramaggregation is not a toplevel aggregation by dropping
asMultiBucketAggregatorin favor ofnatively implementing multi-bucket storage in the aggregator. For the
most part this just uses the
LongKeyedBucketOrdsthat we built thefirst time we did this.