diff --git a/server/src/main/java/org/opensearch/index/fielddata/FieldData.java b/server/src/main/java/org/opensearch/index/fielddata/FieldData.java
index 61e48d05a6263..6db6bbccacae5 100644
--- a/server/src/main/java/org/opensearch/index/fielddata/FieldData.java
+++ b/server/src/main/java/org/opensearch/index/fielddata/FieldData.java
@@ -292,13 +292,6 @@ public static SortedNumericDocValues castToLong(final SortedNumericDoubleValues
         }
     }
 
-    /**
-     * Returns a multi-valued view over the provided {@link NumericDoubleValues}.
-     */
-    public static SortedNumericUnsignedLongValues singleton(SortedNumericDocValues values) {
-        return new SingletonSortedNumericUnsignedLongValues(values);
-    }
-
     /**
      * Returns a multi-valued view over the provided {@link NumericDoubleValues}.
      */
@@ -318,18 +311,6 @@ public static NumericDoubleValues unwrapSingleton(SortedNumericDoubleValues valu
         return null;
     }
 
-    /**
-     * Returns a single-valued view of the {@link SortedNumericDoubleValues},
-     * if it was previously wrapped with {@link DocValues#singleton(NumericDocValues)},
-     * or null.
-     */
-    public static SortedNumericDocValues unwrapSingleton(SortedNumericUnsignedLongValues values) {
-        if (values instanceof SingletonSortedNumericUnsignedLongValues) {
-            return ((SingletonSortedNumericUnsignedLongValues) values).getNumericUnsignedLongValues();
-        }
-        return null;
-    }
-
     /**
      * Returns a multi-valued view over the provided {@link GeoPointValues}.
      */
diff --git a/server/src/main/java/org/opensearch/index/fielddata/SingletonSortedNumericUnsignedLongValues.java b/server/src/main/java/org/opensearch/index/fielddata/LongToSortedNumericUnsignedLongValues.java
similarity index 74%
rename from server/src/main/java/org/opensearch/index/fielddata/SingletonSortedNumericUnsignedLongValues.java
rename to server/src/main/java/org/opensearch/index/fielddata/LongToSortedNumericUnsignedLongValues.java
index f2ec4d7589b64..eb8d8f1667218 100644
--- a/server/src/main/java/org/opensearch/index/fielddata/SingletonSortedNumericUnsignedLongValues.java
+++ b/server/src/main/java/org/opensearch/index/fielddata/LongToSortedNumericUnsignedLongValues.java
@@ -13,18 +13,15 @@
 import java.io.IOException;
 
 /**
- * Exposes multi-valued view over a single-valued instance.
- * <p>
- * This can be used if you want to have one multi-valued implementation
- * that works for single or multi-valued types.
+ * Wraps long-based {@link SortedNumericDocValues} as unsigned long ones
+ * (primarily used by {@link org.opensearch.search.MultiValueMode}
  *
  * @opensearch.internal
  */
-
-final class SingletonSortedNumericUnsignedLongValues extends SortedNumericUnsignedLongValues {
+public final class LongToSortedNumericUnsignedLongValues extends SortedNumericUnsignedLongValues {
     private final SortedNumericDocValues values;
 
-    SingletonSortedNumericUnsignedLongValues(SortedNumericDocValues values) {
+    public LongToSortedNumericUnsignedLongValues(SortedNumericDocValues values) {
         this.values = values;
     }
 
diff --git a/server/src/main/java/org/opensearch/index/fielddata/fieldcomparator/UnsignedLongValuesComparatorSource.java b/server/src/main/java/org/opensearch/index/fielddata/fieldcomparator/UnsignedLongValuesComparatorSource.java
index fe3270d09c422..6fc85bd0b2689 100644
--- a/server/src/main/java/org/opensearch/index/fielddata/fieldcomparator/UnsignedLongValuesComparatorSource.java
+++ b/server/src/main/java/org/opensearch/index/fielddata/fieldcomparator/UnsignedLongValuesComparatorSource.java
@@ -23,6 +23,7 @@
 import org.opensearch.index.fielddata.IndexFieldData;
 import org.opensearch.index.fielddata.IndexNumericFieldData;
 import org.opensearch.index.fielddata.LeafNumericFieldData;
+import org.opensearch.index.fielddata.LongToSortedNumericUnsignedLongValues;
 import org.opensearch.index.fielddata.SortedNumericUnsignedLongValues;
 import org.opensearch.index.search.comparators.UnsignedLongComparator;
 import org.opensearch.search.DocValueFormat;
@@ -59,7 +60,7 @@ public SortField.Type reducedType() {
 
     private SortedNumericUnsignedLongValues loadDocValues(LeafReaderContext context) {
         final LeafNumericFieldData data = indexFieldData.load(context);
-        return FieldData.singleton(data.getLongValues());
+        return new LongToSortedNumericUnsignedLongValues(data.getLongValues());
     }
 
     private NumericDocValues getNumericDocValues(LeafReaderContext context, BigInteger missingValue) throws IOException {
diff --git a/server/src/main/java/org/opensearch/search/MultiValueMode.java b/server/src/main/java/org/opensearch/search/MultiValueMode.java
index b9df357016788..fa2e776eca67a 100644
--- a/server/src/main/java/org/opensearch/search/MultiValueMode.java
+++ b/server/src/main/java/org/opensearch/search/MultiValueMode.java
@@ -51,6 +51,7 @@
 import org.opensearch.index.fielddata.AbstractNumericDocValues;
 import org.opensearch.index.fielddata.AbstractSortedDocValues;
 import org.opensearch.index.fielddata.FieldData;
+import org.opensearch.index.fielddata.LongToSortedNumericUnsignedLongValues;
 import org.opensearch.index.fielddata.NumericDoubleValues;
 import org.opensearch.index.fielddata.SortedBinaryDocValues;
 import org.opensearch.index.fielddata.SortedNumericDoubleValues;
@@ -1240,7 +1241,11 @@ protected int pick(SortedDocValues values, DocIdSetIterator docItr, int startDoc
      * Allowed Modes: SUM, AVG, MEDIAN, MIN, MAX
      */
     public NumericDocValues select(final SortedNumericUnsignedLongValues values) {
-        final SortedNumericDocValues sortedNumericDocValues = FieldData.unwrapSingleton(values);
+        SortedNumericDocValues sortedNumericDocValues = null;
+        if (values instanceof LongToSortedNumericUnsignedLongValues) {
+            sortedNumericDocValues = ((LongToSortedNumericUnsignedLongValues) values).getNumericUnsignedLongValues();
+        }
+
         final NumericDocValues singleton = DocValues.unwrapSingleton(sortedNumericDocValues);
         if (singleton != null) {
             return singleton;