diff --git a/server/src/main/java/org/opensearch/common/metrics/CounterMetric.java b/server/src/main/java/org/opensearch/common/metrics/CounterMetric.java
index cb181840406a5..33fc5e32e9c60 100644
--- a/server/src/main/java/org/opensearch/common/metrics/CounterMetric.java
+++ b/server/src/main/java/org/opensearch/common/metrics/CounterMetric.java
@@ -32,6 +32,7 @@
 
 package org.opensearch.common.metrics;
 
+import java.io.Serializable;
 import java.util.concurrent.atomic.LongAdder;
 
 /**
diff --git a/server/src/main/java/org/opensearch/index/cache/request/ShardRequestCache.java b/server/src/main/java/org/opensearch/index/cache/request/ShardRequestCache.java
index f09d2504680c7..3194aee757fc4 100644
--- a/server/src/main/java/org/opensearch/index/cache/request/ShardRequestCache.java
+++ b/server/src/main/java/org/opensearch/index/cache/request/ShardRequestCache.java
@@ -37,6 +37,7 @@
 import org.opensearch.core.common.bytes.BytesReference;
 import org.opensearch.indices.TierType;
 
+import java.io.Serializable;
 import java.util.EnumMap;
 
 /**
@@ -113,7 +114,7 @@ public void onRemoval(Accountable key, BytesReference value, boolean evicted, Ti
         statsHolder.get(tierType).totalMetric.dec(dec);
     }
 
-    static class StatsHolder {
+    static class StatsHolder implements Serializable {
 
         final CounterMetric evictionsMetric = new CounterMetric();
         final CounterMetric totalMetric = new CounterMetric();
diff --git a/server/src/test/java/org/opensearch/indices/IndicesRequestCacheTests.java b/server/src/test/java/org/opensearch/indices/IndicesRequestCacheTests.java
index 14cca8ef60681..5636268d78eb1 100644
--- a/server/src/test/java/org/opensearch/indices/IndicesRequestCacheTests.java
+++ b/server/src/test/java/org/opensearch/indices/IndicesRequestCacheTests.java
@@ -67,6 +67,7 @@
 import org.opensearch.common.settings.Settings;
 import org.opensearch.common.util.io.IOUtils;
 import org.opensearch.core.common.bytes.AbstractBytesReference;
+import org.opensearch.core.common.bytes.BytesArray;
 import org.opensearch.core.common.bytes.BytesReference;
 import org.opensearch.core.common.unit.ByteSizeValue;
 import org.opensearch.core.index.shard.ShardId;
@@ -164,7 +165,8 @@ public void testAddDirectToEhcache() throws Exception {
         BytesReference termBytes = XContentHelper.toXContent(termQuery, MediaTypeRegistry.JSON, false);
         IndicesRequestCache.Key key = new IndicesRequestCache.Key(entity, reader.getReaderCacheHelper().getKey(), termBytes);
 
-        TestBytesReference value = new TestBytesReference(124);
+        //TestBytesReference value = new TestBytesReference(124);
+        BytesReference value = new BytesArray(new byte[]{0});
         cache.tieredCacheHandler.getDiskCachingTier().put(key, value);
 
         System.out.println("Size: " + cache.tieredCacheHandler.getDiskCachingTier().count());
@@ -707,7 +709,7 @@ public boolean isFragment() {
         }
     }
 
-    private class TestEntity extends AbstractIndexShardCacheEntity {
+    private class TestEntity extends AbstractIndexShardCacheEntity implements Serializable {
         private final AtomicBoolean standInForIndexShard;
         private final ShardRequestCache shardRequestCache;