#90826 introduced a change to `GetUserPrivilegesResponse` which breaks our `CustomAuthorizationEngine` example plugin. We'll need to update the plugin example here.

cc @n1v0lg
plugins/examples/security-authorization-engine/src/main/java/org/elasticsearch/example/CustomAuthorizationEngine.java
import org.elasticsearch.xpack.core.security.action.user.GetUserPrivilegesResponse.Indices;
import org.elasticsearch.xpack.core.security.authc.Authentication;
import org.elasticsearch.xpack.core.security.authc.Subject;
import org.elasticsearch.xpack.core.security.authz.AuthorizationEngine;
import org.elasticsearch.xpack.core.security.authz.AuthorizationEngine.PrivilegesToCheck;
import org.elasticsearch.xpack.core.security.authz.AuthorizationEngine.PrivilegesCheckResult;
import org.elasticsearch.xpack.core.security.authz.ResolvedIndices;
import org.elasticsearch.xpack.core.security.authz.RoleDescriptor;
import org.elasticsearch.xpack.core.security.authz.RoleDescriptor.IndicesPrivileges;
import org.elasticsearch.xpack.core.security.authz.accesscontrol.IndicesAccessControl;
import org.elasticsearch.xpack.core.security.authz.accesscontrol.IndicesAccessControl.IndexAccessControl;
import org.elasticsearch.xpack.core.security.authz.permission.FieldPermissions;
import org.elasticsearch.xpack.core.security.authz.permission.ResourcePrivileges;
import org.elasticsearch.xpack.core.security.authz.privilege.ApplicationPrivilegeDescriptor;
import org.elasticsearch.xpack.core.security.authz.privilege.ConfigurableClusterPrivilege;
import org.elasticsearch.xpack.core.security.user.User;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
/**
 * A custom implementation of an authorization engine. This engine is extremely basic in that it
 * authorizes based upon the name of a single role. If users have this role they are granted access.
 */
public class CustomAuthorizationEngine implements AuthorizationEngine {