Fix unnecessary context switch in RankFeaturePhase (#113232) #117339
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If we don't actually execute this phase we shouldn't fork the phase unnecessarily. We can compute the RankFeaturePhaseRankCoordinatorContext on the transport thread and move on to fetch without forking. Fetch itself will then fork and we can run the reduce as part of fetch instead of in a separte search pool task (this is the way it worked up until the recent introduction of RankFeaturePhase, this fixes that regression).
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If we don't actually execute this phase we shouldn't fork the phase unnecessarily. We can compute the RankFeaturePhaseRankCoordinatorContext on the transport thread and move on to fetch without forking. Fetch itself will then fork and we can run the reduce as part of fetch instead of in a separte search pool task (this is the way it worked up until the recent introduction of RankFeaturePhase, this fixes that regression).
backport of #113232