backport change (elastic#130631)

Backports the following commits to 9.1:  - Unmute SearchWithRejectionsIT
testOpenContextsAfterRejections (elastic#130628)

Author: drempapis

muted-tests.yml

@@ -296,9 +296,6 @@ tests:
 - class: org.elasticsearch.packaging.test.DockerTests
   method: test023InstallPluginUsingConfigFile
   issue: https://github.com/elastic/elasticsearch/issues/126145
-- class: org.elasticsearch.search.SearchWithRejectionsIT
-  method: testOpenContextsAfterRejections
-  issue: https://github.com/elastic/elasticsearch/issues/126340
 - class: org.elasticsearch.smoketest.MlWithSecurityIT
   method: test {yaml=ml/start_data_frame_analytics/Test start classification analysis when the dependent variable cardinality is too low}
   issue: https://github.com/elastic/elasticsearch/issues/123200

server/src/internalClusterTest/java/org/elasticsearch/search/SearchWithRejectionsIT.java

@@ -58,7 +58,7 @@ public void testOpenContextsAfterRejections() throws Exception {
         }
         assertBusy(
             () -> assertThat(indicesAdmin().prepareStats().get().getTotal().getSearch().getOpenContexts(), equalTo(0L)),
-            1,
+            2,
             TimeUnit.SECONDS
         );
     }