AUTO_BUCKET is not working in the ES|QL notebook

[liu-xiao-guo]

For the notebook at https://github.com/elastic/elasticsearch-labs/blob/main/notebooks/esql/esql-getting-started.ipynb, the following code is not working:

esql_query = """
FROM sample_data
| KEEP @timestamp
| EVAL bucket = AUTO_BUCKET(@timestamp, 24, "2023-10-23T00:00:00Z", "2023-10-23T23:59:59Z")
"""
response = client.esql.query(query=esql_query)
format_response(response)

The error message is shown as:

BadRequestError: BadRequestError(400, 'verification_exception', 'Found 1 problem\nline 4:17: Unknown function [AUTO_BUCKET], did you mean [bucket]?')

![image](https://github.com/elastic/elasticsearch-labs/assets/8455957/be2018cb-a9dd-46fd-a281-30b0c9de00c9)

[liu-xiao-guo]

https://ela.st/ql/ in the notebook does not exist as well.