Fix gradle build issue after upgrade to Lucene 9.3.0 (opensearch-proj…

…ect#1988) (opensearch-project#1990)

Signed-off-by: Craig Perkins <cwperx@amazon.com>
(cherry picked from commit 437eb02)

Co-authored-by: Craig Perkins <cwperx@amazon.com>

src/main/java/org/opensearch/security/configuration/DlsFlsFilterLeafReader.java

@@ -965,7 +965,7 @@ public long nextOrd() throws IOException {
                     }
 
                     @Override
-                    public long docValueCount() {
+                    public int docValueCount() {
                         return sortedSetDocValues.docValueCount();
                     }