[8.x] Sometimes delegate to SourceLoader in ValueSourceReaderOperator for required stored fields #115390
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…equired stored fields (elastic#115114) If source is required by a block loader then the StoredFieldsSpec that gets populated should be enhanced by SourceLoader#requiredStoredFields(...) in ValuesSourceReaderOperator. Otherwise in case of synthetic source many stored fields aren't loaded, which causes only a subset of _source to be synthesized. For example when unmapped fields exist or field values that exceed configured ignore above will not appear is _source. This happens when field types fallback to a block loader implementation that uses _source. The required field values are then extracted from the source once loaded. This change also reverts the production code changes introduced via elastic#114903. That change only ensured that _ignored_source field was added to the required list of stored fields. In reality more fields could be required. This change is better fix, since it handles also other cases and the SourceLoader implementation indicates which stored fields are needed. Closes elastic#115076
martijnvg
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:Analytics/Compute Engine
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Backporting #115114 to 8.x branch.
If source is required by a block loader then the StoredFieldsSpec that gets populated should be enhanced by SourceLoader#requiredStoredFields(...) in ValuesSourceReaderOperator. Otherwise in case of synthetic source many stored fields aren't loaded, which causes only a subset of _source to be synthesized. For example when unmapped fields exist or field values that exceed configured ignore above will not appear is _source.
This happens when field types fallback to a block loader implementation that uses _source. The required field values are then extracted from the source once loaded.
This change also reverts the production code changes introduced via #114903. That change only ensured that _ignored_source field was added to the required list of stored fields. In reality more fields could be required. This change is better fix, since it handles also other cases and the SourceLoader implementation indicates which stored fields are needed.
Closes #115076, #115074, #115073 and #115066