[8.x] Include ignored source as part of loading field values in ValueSourceReaderOperator via BlockSourceReader. (#114903) #115064
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…ReaderOperator via BlockSourceReader. (elastic#114903) Currently, in compute engine when loading source if source mode is synthetic, the synthetic source loader is already used. But the ignored_source field isn't always marked as a required source field, causing the source to potentially miss a lot of fields. This change includes _ignored_source field as a required stored field and allowing keyword fields without doc values or stored fields to be used in case of synthetic source. Relying on synthetic source to get the values (because a field doesn't have stored fields / doc values) is slow. In case of synthetic source we already keep ignored field/values in a special place, named ignored source. Long term in case of synthetic source we should only load ignored source in case a field has no doc values or stored field. Like is being explored in elastic#114886 Thereby avoiding synthesizing the complete _source in order to get only one field.
martijnvg
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:Analytics/Compute Engine
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Backports the following commits to 8.x: