Parallelize knn query rewrite across slices rather than segments

The concurrent query rewrite for knn vectory query introduced with apache#12160
requests one thread per segment to the executor. To align this with the
IndexSearcher parallel behaviour, we should rather parallelize across
slices. Also, we can reuse the same slice executor instance that the
index searcher already holds, in that way we are using a
QueueSizeBasedExecutor when a thread pool executor is provided.

lucene/core/src/java/org/apache/lucene/search/AbstractKnnVectorQuery.java

@@ -19,6 +19,7 @@
 import static org.apache.lucene.search.DocIdSetIterator.NO_MORE_DOCS;
 
 import java.io.IOException;
+import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Comparator;
 import java.util.List;
@@ -81,11 +82,12 @@ public Query rewrite(IndexSearcher indexSearcher) throws IOException {
       filterWeight = null;
     }
 
-    Executor executor = indexSearcher.getExecutor();
+    IndexSearcher.LeafSlice[] slices = indexSearcher.getSlices();
+    SliceExecutor sliceExecutor = indexSearcher.getSliceExecutor();
     TopDocs[] perLeafResults =
-        (executor == null)
+        (sliceExecutor == null)
             ? sequentialSearch(reader.leaves(), filterWeight)
-            : parallelSearch(reader.leaves(), filterWeight, executor);
+            : parallelSearch(slices, filterWeight, sliceExecutor);
 
     // Merge sort the results
     TopDocs topK = TopDocs.merge(k, perLeafResults);
@@ -109,27 +111,38 @@ private TopDocs[] sequentialSearch(
   }
 
   private TopDocs[] parallelSearch(
-      List<LeafReaderContext> leafReaderContexts, Weight filterWeight, Executor executor) {
-    List<FutureTask<TopDocs>> tasks =
-        leafReaderContexts.stream()
-            .map(ctx -> new FutureTask<>(() -> searchLeaf(ctx, filterWeight)))
-            .toList();
+          IndexSearcher.LeafSlice[] slices, Weight filterWeight, SliceExecutor sliceExecutor) {
+
+    List<FutureTask<TopDocs[]>> tasks = new ArrayList<>(slices.length);
+    int segmentsCount = 0;
+    for (IndexSearcher.LeafSlice slice : slices) {
+      segmentsCount += slice.leaves.length;
+      tasks.add(new FutureTask<>(() -> {
+        TopDocs[] results = new TopDocs[slice.leaves.length];
+        int i = 0;
+        for (LeafReaderContext context : slice.leaves) {
+          results[i++] = searchLeaf(context, filterWeight);
+        }
+        return results;
+      }));
+    }
 
-    SliceExecutor sliceExecutor = new SliceExecutor(executor);
     sliceExecutor.invokeAll(tasks);
 
-    return tasks.stream()
-        .map(
-            task -> {
-              try {
-                return task.get();
-              } catch (ExecutionException e) {
-                throw new RuntimeException(e.getCause());
-              } catch (InterruptedException e) {
-                throw new ThreadInterruptedException(e);
-              }
-            })
-        .toArray(TopDocs[]::new);
+    TopDocs[] topDocs = new TopDocs[segmentsCount];
+    int i = 0;
+    for (FutureTask<TopDocs[]> task : tasks) {
+      try {
+        for (TopDocs docs : task.get()) {
+          topDocs[i++] = docs;
+        }
+      } catch (ExecutionException e) {
+        throw new RuntimeException(e.getCause());
+      } catch (InterruptedException e) {
+        throw new ThreadInterruptedException(e);
+      }
+    }
+    return topDocs;
   }
 
   private TopDocs searchLeaf(LeafReaderContext ctx, Weight filterWeight) throws IOException {

lucene/core/src/java/org/apache/lucene/search/IndexSearcher.java

@@ -962,6 +962,10 @@ public Executor getExecutor() {
     return executor;
   }
 
+  SliceExecutor getSliceExecutor() {
+    return sliceExecutor;
+  }
+
   /**
    * Thrown when an attempt is made to add more than {@link #getMaxClauseCount()} clauses. This
    * typically happens if a PrefixQuery, FuzzyQuery, WildcardQuery, or TermRangeQuery is expanded to