[8.19] Fix some inefficiencies in FieldsVisitor (#127688) #127709
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Just a couple obvious finds. No need to start from `null` here, just makes locality worse to so and adds conditionals. Also, we can save some field lookups and a needless hot allocation of `BytesRef` that isn't guaranteed to be escape analyzed away.
original-brownbear
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:Search Foundations/Search
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Backports the following commits to 8.19: