[8.18] Use new source loader when lower docId is accessed (#128320) #128410
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When using synthetic source, runtime fields data may come from doc values. Doc values iterators can only be read once, and in increasing docId order. But if a runtime field is referenced multiple times in a query, currently the same doc value iterator will be used. This causes an error, as the second field reference will attempt to read the same iterator from a lower docId than was previously used. The fix is to create a new source loader, and thus a new doc value iterator, if the requested docId is lower than the last seen docId. (cherry picked from commit 51e87cb) # Conflicts: # server/src/main/java/org/elasticsearch/search/lookup/ConcurrentSegmentSourceProvider.java
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