public QueryExpression <TEntity> Query(DynamoGlobalIndex index, Expression <Func <TEntity, bool> > keyConditionPredicate)
 {
     return(_db.QueryIndex(index, keyConditionPredicate));
 }
 public Task <QueryExpression <TEntity> > QueryAsync(DynamoGlobalIndex index, Expression <Func <TEntity, bool> > keyConditionPredicate)
 {
     return(Task.FromResult(Query(index, keyConditionPredicate)));
 }