code: public ListClustersResponse listClusters(String marker, int maxKeys) {
          return listClusters(new ListClustersRequest().withMaxKeys(maxKeys).withMarker(marker));
      }
docs: List BMR clusters owned by the authenticated user.
  
  @param marker The start record of clusters.
  @param maxKeys The maximum number of clusters returned.
  @return The response containing a list of the BMR clusters owned by the authenticated sender of the request.
  The clusters' records start from the marker and the size of list is limited below maxKeys.