diff --git a/server/src/main/java/org/opensearch/indices/IndicesRequestCache.java b/server/src/main/java/org/opensearch/indices/IndicesRequestCache.java
index 22a7573e135bf..42d7d973d09b8 100644
--- a/server/src/main/java/org/opensearch/indices/IndicesRequestCache.java
+++ b/server/src/main/java/org/opensearch/indices/IndicesRequestCache.java
@@ -106,6 +106,8 @@ public final class IndicesRequestCache implements RemovalListener<IndicesRequest
         Property.NodeScope
     );
 
+    private final static long BASE_RAM_BYTES_USED = RamUsageEstimator.shallowSizeOfInstance(Key.class);
+
     private final ConcurrentMap<CleanupKey, Boolean> registeredClosedListeners = ConcurrentCollections.newConcurrentMap();
     private final Set<CleanupKey> keysToClean = ConcurrentCollections.newConcurrentSet();
     private final ByteSizeValue size;
@@ -265,8 +267,6 @@ interface CacheEntity extends Accountable, Writeable {
      * @opensearch.internal
      */
     class Key implements Accountable, Writeable {
-        private final long BASE_RAM_BYTES_USED = RamUsageEstimator.shallowSizeOfInstance(Key.class);
-
         public final CacheEntity entity; // use as identity equality
         public final String readerCacheKeyId;
         public final BytesReference value;
diff --git a/server/src/main/java/org/opensearch/indices/IndicesService.java b/server/src/main/java/org/opensearch/indices/IndicesService.java
index fd7635307a299..1605d639f2ffd 100644
--- a/server/src/main/java/org/opensearch/indices/IndicesService.java
+++ b/server/src/main/java/org/opensearch/indices/IndicesService.java
@@ -301,6 +301,8 @@ public class IndicesService extends AbstractLifecycleComponent
         Property.Final
     );
 
+    private static long BASE_RAM_BYTES_USED = RamUsageEstimator.shallowSizeOfInstance(IndexShardCacheEntity.class);
+
     /**
      * The node's settings.
      */
@@ -1757,7 +1759,6 @@ private BytesReference cacheShardLevelResult(
      * @opensearch.internal
      */
     public final class IndexShardCacheEntity extends AbstractIndexShardCacheEntity {
-        private final long BASE_RAM_BYTES_USED = RamUsageEstimator.shallowSizeOfInstance(IndexShardCacheEntity.class);
         private final IndexShard indexShard;
 
         public IndexShardCacheEntity(IndexShard indexShard) {