Fix exception when merging completion suggestions (#70414) #70633
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Under certain circumstances we can get "array_index_out_of_bounds" exceptions in
the fetch phase when merging comletion suggestion results with additonal field
collapsing in place. We store the ScoreDoc array in the SortedTopDocs score docs
contain both regular search hits and completion suggestion results added in
SearchPhaseController#sortDocs, so when merging these we need to know the
correct array offset where the completion results begin. This is based on the
hits length calculated in SearchPhaseController#getHits, which doesn't take into
account that there might be suggestion results present when calculating the
number of hits. This change adds the number of suggestions to SortedTopDocs in
order to be able to later account for it when calculating the hits.
Closes #70328