diff --git a/server/src/test/java/org/opensearch/indices/IndicesQueryCacheTests.java b/server/src/test/java/org/opensearch/indices/IndicesQueryCacheTests.java
index 5940cdeb139e7..4cca989843277 100644
--- a/server/src/test/java/org/opensearch/indices/IndicesQueryCacheTests.java
+++ b/server/src/test/java/org/opensearch/indices/IndicesQueryCacheTests.java
@@ -152,7 +152,7 @@ public void testBasics() throws IOException {
         assertEquals(1L, stats.getCacheCount());
         assertEquals(0L, stats.getHitCount());
         assertEquals(1L, stats.getMissCount());
-        assertTrue(stats.getMemorySizeInBytes() >= 0L);
+        assertTrue(stats.getMemorySizeInBytes() > 0L && stats.getMemorySizeInBytes() < Long.MAX_VALUE);
 
         for (int i = 1; i < 20; ++i) {
             assertEquals(1, s.count(new DummyQuery(i)));
@@ -163,7 +163,7 @@ public void testBasics() throws IOException {
         assertEquals(20L, stats.getCacheCount());
         assertEquals(0L, stats.getHitCount());
         assertEquals(20L, stats.getMissCount());
-        assertTrue(stats.getMemorySizeInBytes() >= 0L);
+        assertTrue(stats.getMemorySizeInBytes() > 0L && stats.getMemorySizeInBytes() < Long.MAX_VALUE);
 
         s.count(new DummyQuery(10));
 
@@ -172,7 +172,7 @@ public void testBasics() throws IOException {
         assertEquals(20L, stats.getCacheCount());
         assertEquals(1L, stats.getHitCount());
         assertEquals(20L, stats.getMissCount());
-        assertTrue(stats.getMemorySizeInBytes() >= 0L);
+        assertTrue(stats.getMemorySizeInBytes() > 0L && stats.getMemorySizeInBytes() < Long.MAX_VALUE);
 
         IOUtils.close(r, dir);
 
@@ -182,7 +182,7 @@ public void testBasics() throws IOException {
         assertEquals(20L, stats.getCacheCount());
         assertEquals(1L, stats.getHitCount());
         assertEquals(20L, stats.getMissCount());
-        assertTrue(stats.getMemorySizeInBytes() >= 0L);
+        assertTrue(stats.getMemorySizeInBytes() > 0L && stats.getMemorySizeInBytes() < Long.MAX_VALUE);
 
         cache.onClose(shard);
 
@@ -192,7 +192,7 @@ public void testBasics() throws IOException {
         assertEquals(0L, stats.getCacheCount());
         assertEquals(0L, stats.getHitCount());
         assertEquals(0L, stats.getMissCount());
-        assertTrue(stats.getMemorySizeInBytes() >= 0L);
+        assertTrue(stats.getMemorySizeInBytes() >= 0L && stats.getMemorySizeInBytes() < Long.MAX_VALUE);
 
         cache.close(); // this triggers some assertions
     }
@@ -233,12 +233,14 @@ public void testTwoShards() throws IOException {
         assertEquals(1L, stats1.getCacheCount());
         assertEquals(0L, stats1.getHitCount());
         assertEquals(1L, stats1.getMissCount());
+        assertTrue(stats1.getMemorySizeInBytes() >= 0L && stats1.getMemorySizeInBytes() < Long.MAX_VALUE);
 
         QueryCacheStats stats2 = cache.getStats(shard2);
         assertEquals(0L, stats2.getCacheSize());
         assertEquals(0L, stats2.getCacheCount());
         assertEquals(0L, stats2.getHitCount());
         assertEquals(0L, stats2.getMissCount());
+        assertTrue(stats2.getMemorySizeInBytes() >= 0L && stats2.getMemorySizeInBytes() < Long.MAX_VALUE);
 
         assertEquals(1, s2.count(new DummyQuery(0)));
 
@@ -247,12 +249,14 @@ public void testTwoShards() throws IOException {
         assertEquals(1L, stats1.getCacheCount());
         assertEquals(0L, stats1.getHitCount());
         assertEquals(1L, stats1.getMissCount());
+        assertTrue(stats1.getMemorySizeInBytes() >= 0L && stats1.getMemorySizeInBytes() < Long.MAX_VALUE);
 
         stats2 = cache.getStats(shard2);
         assertEquals(1L, stats2.getCacheSize());
         assertEquals(1L, stats2.getCacheCount());
         assertEquals(0L, stats2.getHitCount());
         assertEquals(1L, stats2.getMissCount());
+        assertTrue(stats2.getMemorySizeInBytes() >= 0L && stats2.getMemorySizeInBytes() < Long.MAX_VALUE);
 
         for (int i = 0; i < 20; ++i) {
             assertEquals(1, s2.count(new DummyQuery(i)));
@@ -263,12 +267,14 @@ public void testTwoShards() throws IOException {
         assertEquals(1L, stats1.getCacheCount());
         assertEquals(0L, stats1.getHitCount());
         assertEquals(1L, stats1.getMissCount());
+        assertTrue(stats1.getMemorySizeInBytes() >= 0L && stats1.getMemorySizeInBytes() < Long.MAX_VALUE);
 
         stats2 = cache.getStats(shard2);
         assertEquals(10L, stats2.getCacheSize());
         assertEquals(20L, stats2.getCacheCount());
         assertEquals(1L, stats2.getHitCount());
         assertEquals(20L, stats2.getMissCount());
+        assertTrue(stats2.getMemorySizeInBytes() >= 0L && stats2.getMemorySizeInBytes() < Long.MAX_VALUE);
 
         IOUtils.close(r1, dir1);
 
@@ -278,12 +284,14 @@ public void testTwoShards() throws IOException {
         assertEquals(1L, stats1.getCacheCount());
         assertEquals(0L, stats1.getHitCount());
         assertEquals(1L, stats1.getMissCount());
+        assertTrue(stats1.getMemorySizeInBytes() >= 0L && stats1.getMemorySizeInBytes() < Long.MAX_VALUE);
 
         stats2 = cache.getStats(shard2);
         assertEquals(10L, stats2.getCacheSize());
         assertEquals(20L, stats2.getCacheCount());
         assertEquals(1L, stats2.getHitCount());
         assertEquals(20L, stats2.getMissCount());
+        assertTrue(stats2.getMemorySizeInBytes() >= 0L && stats2.getMemorySizeInBytes() < Long.MAX_VALUE);
 
         cache.onClose(shard1);
 
@@ -293,12 +301,14 @@ public void testTwoShards() throws IOException {
         assertEquals(0L, stats1.getCacheCount());
         assertEquals(0L, stats1.getHitCount());
         assertEquals(0L, stats1.getMissCount());
+        assertTrue(stats1.getMemorySizeInBytes() >= 0L && stats1.getMemorySizeInBytes() < Long.MAX_VALUE);
 
         stats2 = cache.getStats(shard2);
         assertEquals(10L, stats2.getCacheSize());
         assertEquals(20L, stats2.getCacheCount());
         assertEquals(1L, stats2.getHitCount());
         assertEquals(20L, stats2.getMissCount());
+        assertTrue(stats2.getMemorySizeInBytes() >= 0L && stats2.getMemorySizeInBytes() < Long.MAX_VALUE);
 
         IOUtils.close(r2, dir2);
         cache.onClose(shard2);
@@ -309,12 +319,14 @@ public void testTwoShards() throws IOException {
         assertEquals(0L, stats1.getCacheCount());
         assertEquals(0L, stats1.getHitCount());
         assertEquals(0L, stats1.getMissCount());
+        assertTrue(stats1.getMemorySizeInBytes() >= 0L && stats1.getMemorySizeInBytes() < Long.MAX_VALUE);
 
         stats2 = cache.getStats(shard2);
         assertEquals(0L, stats2.getCacheSize());
         assertEquals(0L, stats2.getCacheCount());
         assertEquals(0L, stats2.getHitCount());
         assertEquals(0L, stats2.getMissCount());
+        assertTrue(stats2.getMemorySizeInBytes() >= 0L && stats2.getMemorySizeInBytes() < Long.MAX_VALUE);
 
         cache.close(); // this triggers some assertions
     }