Fix Lucene tests operator status check

Author: ivancea

x-pack/plugin/esql/compute/test/src/main/java/org/elasticsearch/compute/test/SourceOperatorTestCase.java

@@ -22,7 +22,7 @@ protected void assertStatus(Map<String, Object> map, List<Page> input, List<Page
             map,
             matchesMap().extraOk()
                 .entry("pages_emitted", output.size())
-                .entry("rows_emitted", output.stream().mapToLong(Page::getPositionCount).sum())
+                .entry("rows_emitted", output.stream().mapToInt(Page::getPositionCount).sum())
         );
     }
 }