Christoph Büscher 82096d3971
Enable SourceLookup to leverage sequential stored fields reader (#63035) (#63316)
In #62509 we already plugged faster sequential access for stored fields in the fetch phase.
This PR now adds using the potentially better field reader also in SourceLookup.
Rally exeriments are showing that this speeds up e.g. when runtime fields that are using
"_source" are added e.g. via "docvalue_fields" or are used in queries or aggs.

Closes #62621
2020-10-06 14:34:39 +02:00
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