Skip over metadata fields in the field retrieval API. #58710
Merged
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This avoids unnecessary lookups, since metadata fields don't have _source
values. Plus, many of them already come back as top-level fields in the search
response, such as
_id,_index,_routing, etc.In the future we can consider support for metadata fields like
_size, thatmust be explicitly retrieved but whose values aren't stored in the document
source.