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
}
        private void onReadsComplete(Collection<NodeResponse> responses, WriteDetails write1Details, @Nullable WriteDetails write2Details) {
            if (task.isCancelled()) {
                cleanUpAndReturnFailure(
                    new RepositoryVerificationException(request.getRepositoryName(), "cancelled during checksum verification")
                );
                return;
            }
            final long checksumLength = checksumEnd - checksumStart;
            final String expectedChecksumDescription;
            final LongPredicate checksumPredicate;
            if (write2Details == null) {
                checksumPredicate = l -> l == write1Details.checksum;
                expectedChecksumDescription = Long.toString(write1Details.checksum);
            e {
                checksumPredicate = l -> l == write1Details.checksum || l == write2Details.checksum;
                expectedChecksumDescription = write1Details.checksum + " or " + write2Details.checksum;
            }
            boolean anyFound = false;
            RepositoryVerificationException failure = null;
            for (final NodeResponse nodeResponse : responses) {
                final GetBlobChecksumAction.Response response = nodeResponse.response;
                final RepositoryVerificationException nodeFailure;
                if (response.isNotFound()) {
                    if (request.readEarly || request.getAbortWrite()) {
                        nodeFailure = null; // "not found" is legitimate iff we tried to read it before the write completed
                    e {
                        nodeFailure = new RepositoryVerificationException(
                            request.getRepositoryName(),
                            "node [" + nodeResponse.node + "] reported blob not found after it was written"