diff --git a/server/src/main/java/org/elasticsearch/indices/flush/SyncedFlushService.java b/server/src/main/java/org/elasticsearch/indices/flush/SyncedFlushService.java
index 553744e66ef04..52e0ac8ab860f 100644
--- a/server/src/main/java/org/elasticsearch/indices/flush/SyncedFlushService.java
+++ b/server/src/main/java/org/elasticsearch/indices/flush/SyncedFlushService.java
@@ -19,6 +19,7 @@
 package org.elasticsearch.indices.flush;
 
 import org.apache.logging.log4j.message.ParameterizedMessage;
+import org.elasticsearch.Assertions;
 import org.elasticsearch.ElasticsearchException;
 import org.elasticsearch.Version;
 import org.elasticsearch.action.ActionListener;
@@ -501,8 +502,18 @@ private InFlightOpsResponse performInFlightOps(InFlightOpsRequest request) {
         if (indexShard.routingEntry().primary() == false) {
             throw new IllegalStateException("[" + request.shardId() +"] expected a primary shard");
         }
+        if (Assertions.ENABLED) {
+            if (logger.isTraceEnabled()) {
+                logger.trace("in flight operations {}, acquirers {}", indexShard.getActiveOperationsCount(), indexShard.getActiveOperations());
+            }
+        }
         int opCount = indexShard.getActiveOperationsCount();
-        logger.trace("{} in flight operations sampled at [{}]", request.shardId(), opCount);
+        // Need to snapshot the debug info twice as it's updated concurrently with the permit count.
+        if (Assertions.ENABLED) {
+            if (logger.isTraceEnabled()) {
+                logger.trace("in flight operations {}, acquirers {}", indexShard.getActiveOperationsCount(), indexShard.getActiveOperations());
+            }
+        }
         return new InFlightOpsResponse(opCount);
     }
 
diff --git a/server/src/test/java/org/elasticsearch/indices/flush/FlushIT.java b/server/src/test/java/org/elasticsearch/indices/flush/FlushIT.java
index 74106df224851..e31e605b6b10f 100644
--- a/server/src/test/java/org/elasticsearch/indices/flush/FlushIT.java
+++ b/server/src/test/java/org/elasticsearch/indices/flush/FlushIT.java
@@ -254,8 +254,7 @@ private String syncedFlushDescription(ShardsSyncedFlushResult result) {
             result.totalShards(), result.failed(), result.failureReason(), detail);
     }
 
-    @TestLogging("_root:DEBUG")
-    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/29392")
+    @TestLogging("_root:DEBUG,org.elasticsearch.indices.flush:TRACE")
     public void testSyncedFlushSkipOutOfSyncReplicas() throws Exception {
         internalCluster().ensureAtLeastNumDataNodes(between(2, 3));
         final int numberOfReplicas = internalCluster().numDataNodes() - 1;
@@ -297,8 +296,7 @@ public void testSyncedFlushSkipOutOfSyncReplicas() throws Exception {
         assertThat(fullResult.successfulShards(), equalTo(numberOfReplicas + 1));
     }
 
-    @TestLogging("_root:DEBUG")
-    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/29392")
+    @TestLogging("_root:DEBUG,org.elasticsearch.indices.flush:TRACE")
     public void testDoNotRenewSyncedFlushWhenAllSealed() throws Exception {
         internalCluster().ensureAtLeastNumDataNodes(between(2, 3));
         final int numberOfReplicas = internalCluster().numDataNodes() - 1;