fix optimization to not do sorting when searching with score "desc" sorting

modules/elasticsearch/src/main/java/org/elasticsearch/search/query/QueryPhase.java

@@ -102,7 +102,7 @@ public class QueryPhase implements SearchPhase {
             boolean sort = false;
             // try and optimize for a case where the sorting is based on score, this is how we work by default!
             if (searchContext.sort() != null) {
-                if (searchContext.sort().getSort().length > 0) {
+                if (searchContext.sort().getSort().length > 1) {
                     sort = true;
                 } else {
                     SortField sortField = searchContext.sort().getSort()[0];