Actions `cluster:admin/repository/analyze/blob` and `cluster:admin/repository/analyze/register` and so on are only invoked via the transport service, they do not need to register as client actions so we can drop the `ActionType` instance. Instead the root `RepositoryAnalyzeAction` should create and register all these transport actions itself. But even the root `RepositoryAnalyzeAction` should not be an `ActionType` derivative, we should just declare an `ActionType` instance directly. Moreover we can use `ActionType#localOnly` since the client action does not run on remote clusters.
x-pack/plugin/snapshot-repo-test-kit/src/main/java/org/elasticsearch/repositories/blobstore/testkit/RepositoryAnalyzeAction.java
private static final Logger logger = LogManager.getLogger(RepositoryAnalyzeAction.class);
    public static final RepositoryAnalyzeAction INSTANCE = new RepositoryAnalyzeAction();
    public static final String NAME = "cluster:admin/repository/analyze";
    static final String UNCONTENDED_REGISTER_NAME_PREFIX = "test-register-uncontended-";
    static final String CONTENDED_REGISTER_NAME_PREFIX = "test-register-contended-";
    private RepositoryAnalyzeAction() {
        super(NAME, Response::new);
    }
    public static class TransportAction extends HandledTransportAction<Request, Response> {