Wrong mypy annotation for _TYPE_HOSTS

[pklejch]

Elasticsearch version (bin/elasticsearch --version): 8.9.0 (but it's not relevant to this bug)

elasticsearch-py version (elasticsearch.__versionstr__): 8.10.0

Description of the problem including expected versus actual behavior:
Currently _TYPE_HOSTS has type annotation defined as

_TYPE_HOSTS = Union[str, List[Union[str, Mapping[str, Union[str, int]], NodeConfig]]]

The problem is that List is invariant and thus List[str] is not valid subtype for List[Union[str, Mapping[str, Union[str, int]], NodeConfig]]]

See common mypy issue python/mypy#3351

The solution is to replace List with Sequence.

Steps to reproduce:
Minimal example

import elasticsearch

HOSTS = ['http://localhost:9200', 'http://localhost:10200']  # this will be inferred as list[str]

client = elasticsearch.Elasticsearch(hosts=HOSTS)

Mypy output

test.py:5: error: Argument "hosts" to "Elasticsearch" has incompatible type "list[str]"; expected "str | list[str | Mapping[str, str | int] | NodeConfig] | None"  [arg-type]
test.py:5: note: "List" is invariant -- see https://mypy.readthedocs.io/en/stable/common_issues.html#variance
test.py:5: note: Consider using "Sequence" instead, which is covariant

[pquentin]

Thanks for the report. We're aware of this bug and plan to fix it soon. Closing in favor of #2273

[pquentin]

Sorry, reopening as I realized the fix for this issue is going to be different as _TYPE_HOSTS is not generated.