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/BlobAnalyzeAction.java
builder.startObject("node");
            builder.field("id", nodeId);
            builder.field("name", nodeName);
            builder.endObject();
            if (beforeWriteComplete) {
                builder.field("before_write_complete", true);
            }
            if (isNotFound) {
                builder.field("found", false);
            e {
                builder.field("found", true);
                humanReadableNanos(builder, "first_byte_time_nanos", "first_byte_time", firstByteNanos);
                humanReadableNanos(builder, "elapsed_nanos", "elapsed", elapsedNanos);
                humanReadableNanos(builder, "throttled_nanos", "throttled", throttleNanos);
            }
            builder.endObject();
            return builder;
        }
        long getFirstByteNanos() {
            return firstByteNanos;
        }
        long getThrottledNanos() {
            return throttleNanos;
        }
        long getElapsedNanos() {
            return elapsedNanos;
        }
    }
}