Fix bug where fvh fragments could be loaded from wrong doc #66141
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…5641) This PR fixes a regression where fvh fragments could be loaded from the wrong document _source. Some `FragmentsBuilder` implementations contain a `SourceLookup` to load from _source. The lookup should be positioned to load from the current hit document. However, since `FragmentsBuilder` are cached and shared across hits, the lookup is never updated to load from the new documents. This means we accidentally load _source from a different document. The regression was introduced in elastic#60179, which started storing `SourceLookup` on `FragmentsBuilder`. Fixes elastic#65533.
jtibshirani
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Backport of #65641.