Julie Tibshirani b2d3c3f6f9
Fix bug where fvh fragments could be loaded from wrong doc (#66142)
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 #60179, which started storing `SourceLookup`
on `FragmentsBuilder`.

Fixes #65533.
2020-12-09 17:52:58 -08:00
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