/// <inheritdoc />
 public virtual IEnumerable <string> CreateMany(
     IEnumerable <CreateIndexModel <TDocument> > models,
     CreateManyIndexesOptions options,
     CancellationToken cancellationToken = default(CancellationToken))
 {
     throw new NotImplementedException();
 }
 /// <inheritdoc />
 public virtual Task <IEnumerable <string> > CreateManyAsync(
     IClientSessionHandle session,
     IEnumerable <CreateIndexModel <TDocument> > models,
     CreateManyIndexesOptions options,
     CancellationToken cancellationToken = default(CancellationToken))
 {
     throw new NotImplementedException();
 }