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
builder.field("repository", repositoryName);
            builder.field("blob_count", blobCount);
            builder.field("concurrency", concurrency);
            builder.field("read_node_count", readNodeCount);
            builder.field("early_read_node_count", earlyReadNodeCount);
            builder.humanReadableField("max_blob_size_bytes", "max_blob_size", maxBlobSize);
            builder.humanReadableField("max_total_data_size_bytes", "max_total_data_size", maxTotalDataSize);
            builder.field("seed", seed);
            builder.field("rare_action_probability", rareActionProbability);
            builder.field("blob_path", blobPath);
            builder.startArray("issues_detected");
            
            
            builder.endArray();
            builder.field("summary", summary);
            if (blobResponses.size() > 0) {
                builder.startArray("details");
                for (BlobAnalyzeAction.Response blobResponse : blobResponses) {
                    blobResponse.toXContent(builder, params);
                }
                builder.endArray();
            }
            humanReadableNanos(builder, "listing_elapsed_nanos", "listing_elapsed", listingTimeNanos);
            humanReadableNanos(builder, "delete_elapsed_nanos", "delete_elapsed", deleteTimeNanos);
            builder.endObject();
            return builder;
        }
    }
}