diff --git a/libs/common/src/main/java/org/opensearch/common/Numbers.java b/libs/common/src/main/java/org/opensearch/common/Numbers.java
index 8fb1922086c68..d5a364a4a934e 100644
--- a/libs/common/src/main/java/org/opensearch/common/Numbers.java
+++ b/libs/common/src/main/java/org/opensearch/common/Numbers.java
@@ -47,8 +47,8 @@ public final class Numbers {
     public static final long MIN_UNSIGNED_LONG_VALUE_AS_LONG = MIN_UNSIGNED_LONG_VALUE.longValue();
     public static final long MAX_UNSIGNED_LONG_VALUE_AS_LONG = MAX_UNSIGNED_LONG_VALUE.longValue();
 
-    public static final BigInteger MAX_LONG_VALUE = BigInteger.valueOf(Long.MAX_VALUE);
-    public static final BigInteger MIN_LONG_VALUE = BigInteger.valueOf(Long.MIN_VALUE);
+    private static final BigInteger MAX_LONG_VALUE = BigInteger.valueOf(Long.MAX_VALUE);
+    private static final BigInteger MIN_LONG_VALUE = BigInteger.valueOf(Long.MIN_VALUE);
 
     private Numbers() {}
 
diff --git a/server/src/main/java/org/opensearch/index/search/comparators/UnsignedLongComparator.java b/server/src/main/java/org/opensearch/index/search/comparators/UnsignedLongComparator.java
index e3817b2210665..22a818ab52547 100644
--- a/server/src/main/java/org/opensearch/index/search/comparators/UnsignedLongComparator.java
+++ b/server/src/main/java/org/opensearch/index/search/comparators/UnsignedLongComparator.java
@@ -53,12 +53,12 @@ public LeafFieldComparator getLeafComparator(LeafReaderContext context) throws I
 
     @Override
     protected long missingValueAsComparableLong() {
-        return unsignedLongToSignedLong(missingValue);
+        return unSignedToSignedLong(missingValue);
     }
 
     @Override
     protected long sortableBytesToLong(byte[] bytes) {
-        return unsignedLongToSignedLong(NumericUtils.sortableBytesToBigInt(bytes, 0, BigIntegerPoint.BYTES));
+        return unSignedToSignedLong(NumericUtils.sortableBytesToBigInt(bytes, 0, BigIntegerPoint.BYTES));
     }
 
     /** Leaf comparator for {@link UnsignedLongComparator} that provides skipping functionality */
@@ -100,27 +100,19 @@ public void copy(int slot, int doc) throws IOException {
 
         @Override
         protected long bottomAsComparableLong() {
-            return unsignedLongToSignedLong(bottom);
+            return unSignedToSignedLong(bottom);
         }
 
         @Override
         protected long topAsComparableLong() {
-            return unsignedLongToSignedLong(topValue);
+            return unSignedToSignedLong(topValue);
         }
     }
 
     /**
-     * Handles overflow in conversion.
-     * @param value : Unsigned long
-     * @return : Signed long representing value's position in number line as much as possible within bounds.
+     * Converts unsigned long to signed the same as java.lang.{@link Long#compareUnsigned(long, long)}
      */
-    private static long unsignedLongToSignedLong(BigInteger value) {
-        if (value.compareTo(Numbers.MIN_LONG_VALUE) < 0) {
-            return Long.MIN_VALUE;
-        } else if (value.compareTo(Numbers.MAX_LONG_VALUE) > 0) {
-            return Long.MAX_VALUE;
-        } else {
-            return value.longValue();
-        }
+    private static long unSignedToSignedLong(BigInteger value) {
+        return value.longValue() + Long.MIN_VALUE;
     }
 }