[8.18] Unmute test and fix for SearchWithRandomDisconnectsIT::testSearchWithRandomDisconnects (#125838) (#126095)

* annotate test class and umnute test

* Add missing import

Author: drempapis

muted-tests.yml

@@ -241,9 +241,6 @@ tests:
 - class: org.elasticsearch.xpack.inference.InferenceRestIT
   method: test {p0=inference/30_semantic_text_inference_bwc/Calculates embeddings using the default ELSER 2 endpoint}
   issue: https://github.com/elastic/elasticsearch/issues/117349
-- class: org.elasticsearch.search.basic.SearchWithRandomDisconnectsIT
-  method: testSearchWithRandomDisconnects
-  issue: https://github.com/elastic/elasticsearch/issues/116175
 - class: org.elasticsearch.discovery.ClusterDisruptionIT
   method: testAckedIndexing
   issue: https://github.com/elastic/elasticsearch/issues/117024

server/src/internalClusterTest/java/org/elasticsearch/search/basic/SearchWithRandomDisconnectsIT.java

@@ -8,6 +8,7 @@
  */
 package org.elasticsearch.search.basic;
 
+import org.apache.lucene.tests.util.LuceneTestCase;
 import org.elasticsearch.action.ActionListener;
 import org.elasticsearch.action.bulk.BulkRequestBuilder;
 import org.elasticsearch.action.search.SearchRequestBuilder;
@@ -28,6 +29,7 @@
 
 import static org.elasticsearch.test.hamcrest.ElasticsearchAssertions.assertAcked;
 
+@LuceneTestCase.SuppressFileSystems(value = "HandleLimitFS") // we sometimes have >2048 open files
 public class SearchWithRandomDisconnectsIT extends AbstractDisruptionTestCase {
 
     public void testSearchWithRandomDisconnects() throws InterruptedException, ExecutionException {