private async Task SetIndexes(IDatabaseProvider databaseProvider)
{
var session = await databaseProvider.StartSession();
var collection = databaseProvider.Database.GetCollection <Product>(MongoUtil.GetCollectionName <Product>());
var options = new CreateIndexOptions()
{
Unique = true
};
var indexKeysDefinition = Builders <Product> .IndexKeys.Ascending(p => p.PZN);
await collection.Indexes.CreateOneAsync(new CreateIndexModel <Product>(indexKeysDefinition, options));
await session.CommitTransactionAsync();
}