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
humanReadableNanos(builder, "write_elapsed_nanos", "write_elapsed", writeElapsedNanos);
            if (overwrite) {
                humanReadableNanos(builder, "overwrite_elapsed_nanos", "overwrite_elapsed", overwriteElapsedNanos);
            }
            humanReadableNanos(builder, "write_throttled_nanos", "write_throttled", writeThrottledNanos);
            builder.startArray("reads");
            for (ReadDetail readDetail : readDetails) {
                readDetail.toXContent(builder, params);
            }
            builder.endArray();
            builder.endObject();
            return builder;
        }
        long getWriteBytes() {
            return blobLength + (overwrite ? blobLength : 0L);
        }
        long getWriteThrottledNanos() {
            return writeThrottledNanos;
        }
        long getWriteElapsedNanos() {
            return writeElapsedNanos + overwriteElapsedNanos;
        }
        List<ReadDetail> getReadDetails() {
            return readDetails;
        }
        long getChecksumBytes() {
            return checksumEnd - checksumStart;
        }
    }
    public static class ReadDetail implements Writeable, ToXContentFragment {