clear the percolator reader from the cache explicitly

modules/elasticsearch/src/main/java/org/elasticsearch/index/percolator/PercolatorService.java

@@ -100,6 +100,7 @@ public class PercolatorService extends AbstractIndexComponent {
             throw new PercolatorException(index, "failed to load queries from percolator index");
         } finally {
             searcher.release();
+            indexService.cache().clear(searcher.reader());
         }
     }