Inject split shard count summary in createSearchContext

Author: bcully

server/src/main/java/org/elasticsearch/search/SearchService.java

@@ -1454,7 +1454,7 @@ protected SearchContext createContext(
     public SearchContext createSearchContext(ShardSearchRequest request, TimeValue timeout) throws IOException {
         final IndexService indexService = indicesService.indexServiceSafe(request.shardId().getIndex());
         final IndexShard indexShard = indexService.getShard(request.shardId().getId());
-        final Engine.SearcherSupplier reader = indexShard.acquireSearcherSupplier();
+        final Engine.SearcherSupplier reader = indexShard.acquireSearcherSupplier(request.getSplitShardCountSummary());
         final ShardSearchContextId id = new ShardSearchContextId(sessionId, idGenerator.incrementAndGet(), reader.getSearcherId());
         try (ReaderContext readerContext = new ReaderContext(id, indexService, indexShard, reader, -1L, true)) {
             // Use ResultsType.QUERY so that the created search context can execute queries correctly.