docs: CompletableFuture<Void> update(PartitionMetadata metadata, PartitionManagementService managementService) {
      if (server == null && metadata.members().contains(managementService.getMembershipService().getLocalMember().id())) {
        server = createServer(managementService);
        return server.join(metadata.members());
      } else if (server != null && !metadata.members().contains(managementService.getMembershipService().getLocalMember().id())) {
        return server.leave().thenRun(() -> server = null);
      }
      return CompletableFuture.completedFuture(null);
    }