naming nit

Author: slobodanadamovic

x-pack/plugin/security/src/main/java/org/elasticsearch/xpack/security/authz/store/NativeRolesStore.java

@@ -177,7 +177,7 @@ public void accept(Set<String> names, ActionListener<RoleRetrievalResult> listen
         getRoleDescriptors(names, listener);
     }
 
-    private Set<String> filterReservedRoles(Set<String> names) {
+    private Set<String> filterReservedRoleNames(Set<String> names) {
         if (names == null || names.isEmpty()) {
             return names;
         }
@@ -199,7 +199,7 @@ public void getRoleDescriptors(Set<String> names, final ActionListener<RoleRetri
             return;
         }
 
-        final Set<String> rolesToGet = filterReservedRoles(names);
+        final Set<String> rolesToGet = filterReservedRoleNames(names);
         if ((names != null && names.size() > 0) && (rolesToGet == null || rolesToGet.isEmpty())) {
             // if we have no roles to get, it means all requested roles were reserved.
             // we can short-circuit and return an empty set here.