Re-enable test and add logging

Author: idegtiarenko

muted-tests.yml

@@ -356,9 +356,6 @@ tests:
 - class: org.elasticsearch.indices.stats.IndexStatsIT
   method: testThrottleStats
   issue: https://github.com/elastic/elasticsearch/issues/125910
-- class: org.elasticsearch.xpack.esql.action.ManyShardsIT
-  method: testCancelUnnecessaryRequests
-  issue: https://github.com/elastic/elasticsearch/issues/125947
 - class: org.elasticsearch.xpack.ilm.actions.SearchableSnapshotActionIT
   method: testResumingSearchableSnapshotFromPartialToFull
   issue: https://github.com/elastic/elasticsearch/issues/125789

x-pack/plugin/esql/src/internalClusterTest/java/org/elasticsearch/xpack/esql/action/ManyShardsIT.java

@@ -25,6 +25,7 @@
 import org.elasticsearch.rest.RestStatus;
 import org.elasticsearch.search.MockSearchService;
 import org.elasticsearch.search.SearchService;
+import org.elasticsearch.test.junit.annotations.TestIssueLogging;
 import org.elasticsearch.test.transport.MockTransportService;
 import org.elasticsearch.transport.RemoteTransportException;
 import org.elasticsearch.transport.TransportChannel;
@@ -259,6 +260,10 @@ public void testLimitConcurrentShards() {
         }
     }
 
+    @TestIssueLogging(
+        issueUrl = "https://github.com/elastic/elasticsearch/issues/125947",
+        value = "logger.org.elasticsearch.cluster.routing.allocation.ShardChangesObserver:TRACE"
+    )
     public void testCancelUnnecessaryRequests() {
         assumeTrue("Requires pragmas", canUseQueryPragmas());
         internalCluster().ensureAtLeastNumDataNodes(3);