Support publishing to Elasticsearch serverless #499
Description
Currently, Elasticsearch serverless is not supported (in particular, by the requirement of the manage_ilm permission, but there may be other things as well).
The main error I have seen is the following:
[custom_components.elasticsearch] Error publishing documents to Elasticsearch: ('154 document(s) failed to index.', [{'create': {'_index': 'metrics-homeassistant.sensor-default', '_id': None, 'status': 400, 'error': {'type': 'illegal_argument_exception', 'reason': "Error extracting routing: source didn't contain any routing fields"}, 'data': ...}