Add sort optimization with after from Lucene

Lucene 8.7 introduces numeric sort optimization directly in comparators.
This means we don't need to have it in ES.
This removes the sort optimization code in ES, and
the only thing that is needed is setCanUsePoints on sortField.

This also will introduce sort optimization with search_after,
as Lucene directly suports sort optimization with search_after.

Author: mayya-sharipova

server/src/main/java/org/elasticsearch/search/internal/ContextIndexSearcher.java

@@ -176,6 +176,8 @@ public Weight createWeight(Query query, ScoreMode scoreMode, float boost) throws
     @SuppressWarnings({"unchecked", "rawtypes"})
     public void search(List<LeafReaderContext> leaves, Weight weight, CollectorManager manager,
             QuerySearchResult result, DocValueFormat[] formats, TotalHits totalHits) throws IOException {
+        // As a single collector expects segments in order of doc,
+        // and we reordered segments, we have to create a separate collector for each segment.
         final List<Collector> collectors = new ArrayList<>(leaves.size());
         for (LeafReaderContext ctx : leaves) {
             final Collector collector = manager.newCollector();
@@ -195,7 +197,7 @@ public void search(List<LeafReaderContext> leaves, Weight weight, CollectorManag
     }
 
     @Override
-    protected void search(List<LeafReaderContext> leaves, Weight weight, Collector collector) throws IOException {
+    public void search(List<LeafReaderContext> leaves, Weight weight, Collector collector) throws IOException {
         for (LeafReaderContext ctx : leaves) { // search each subreader
             searchLeaf(ctx, weight, collector);
         }