With an `sagemaker.estimator.Estimator`, I want to re-[deploy](https://sagemaker.readthedocs.io/en/stable/api/training/estimators.html#sagemaker.estimator.EstimatorBase.deploy) a model after retraining (calling `fit` with new data).

When I call this

```
estimator.deploy(initial_instance_count=1, instance_type='ml.m5.xlarge')

```

I get an error

```
botocore.exceptions.ClientError: An error occurred (ValidationException) 
when calling the CreateEndpoint operation: 
Cannot create already existing endpoint "arn:aws:sagemaker:eu-east- 
1:1776401913911:endpoint/zyx".

```

Apparently I want to use functionality like [UpdateEndpoint](https://docs.aws.amazon.com/sagemaker/latest/APIReference/API_UpdateEndpoint.html). How do I access that functionality from this API?