Update server/src/main/java/org/opensearch/indices/SystemIndexRegistr…

…y.java

Co-authored-by: Andriy Redko <drreta@gmail.com>
Signed-off-by: Craig Perkins <craig5008@gmail.com>

server/src/main/java/org/opensearch/indices/SystemIndexRegistry.java

@@ -72,7 +72,7 @@ public static Set<String> matchesPluginSystemIndexPattern(String pluginClassName
             .collect(Collectors.toSet());
     }
 
-    public static List<SystemIndexDescriptor> getAllDescriptors() {
+    static List<SystemIndexDescriptor> getAllDescriptors() {
         return SYSTEM_INDEX_DESCRIPTORS_MAP.values().stream().flatMap(Collection::stream).collect(Collectors.toList());
     }