[8.9] Set new providers before building FetchSubPhaseProcessors (#97460) #97500
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) The FetchPhase sets source and field providers on its SearchLookup instance to ensure that we only have to load stored fields once per document. However, these were being set after subprocessors were constructed, and the FetchFieldsPhase subprocessor pulls a reference to the SearchLookup at construction time. This meant that the FieldsFetcher was not using these providers, instead using the standard source and fields lookup, in effect meaning that fields access would load source and fields separately. This would mostly just be an issue with performance; however, the top hits aggregation calls the fetch phase multiple times, with the result that the second and subsequent buckets in a top hits aggregation would see the source lookup from the previous bucket when building their FetchFieldsPhase subprocessor. This commit moves the call to SearchExecutionContext#setLookupProviders() in FetchPhase#buildSearchHits() before the call to build fetch phase subprocessors, ensuring that the fetch fields phase sees the correct SearchLookup. Fixes elastic#96284
romseygeek added :Analytics/Aggregations 
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Backports the following commits to 8.9: