diff --git a/server/src/main/java/org/elasticsearch/common/Rounding.java b/server/src/main/java/org/elasticsearch/common/Rounding.java
index 451517481b75c..63f30a9c4fb08 100644
--- a/server/src/main/java/org/elasticsearch/common/Rounding.java
+++ b/server/src/main/java/org/elasticsearch/common/Rounding.java
@@ -252,7 +252,7 @@ static class TimeUnitRounding extends Rounding {
         }
 
         TimeUnitRounding(StreamInput in) throws IOException {
-            this(DateTimeUnit.resolve(in.readByte()), in.readZoneId());
+            this(DateTimeUnit.resolve(in.readByte()), DateUtils.of(in.readString()));
         }
 
         @Override
@@ -467,7 +467,7 @@ static class TimeIntervalRounding extends Rounding {
         }
 
         TimeIntervalRounding(StreamInput in) throws IOException {
-            this(in.readVLong(), in.readZoneId());
+            this(in.readVLong(), DateUtils.of(in.readString()));
         }
 
         @Override
diff --git a/server/src/test/java/org/elasticsearch/search/aggregations/InternalAggregationsTests.java b/server/src/test/java/org/elasticsearch/search/aggregations/InternalAggregationsTests.java
index 9dc214f3d1993..c19727041ddd9 100644
--- a/server/src/test/java/org/elasticsearch/search/aggregations/InternalAggregationsTests.java
+++ b/server/src/test/java/org/elasticsearch/search/aggregations/InternalAggregationsTests.java
@@ -120,7 +120,6 @@ public static InternalAggregations createTestInstance() throws Exception {
         return new InternalAggregations(aggsList, topLevelPipelineAggs);
     }
 
-    @AwaitsFix(bugUrl = "https://github.com/elastic/elasticsearch/issues/50827")
     public void testSerialization() throws Exception {
         InternalAggregations aggregations = createTestInstance();
         writeToAndReadFrom(aggregations, 0);