Client

Added

Added the top-level .options() method to Elasticsearch and AsyncElasticsearch for modifying transport options.
Added parameters corresponding to JSON request body fields for all APIs
Added basic_auth parameter for specifying username and password authentication
Added bearer_auth parameter for specifying an HTTP bearer token or service token
Added the meta property to ApiError to access the HTTP response metadata of an error.
Added a check that a compatible version of the elastic-transport package is installed.

Changed the transport layer to use the elastic-transport package
Changed user-defined body parameters to have semantic names (e.g index(document={...}) instead of index(body={...})).
Changed responses to be objects with two properties, meta for response metadata (HTTP status, headers, node, etc) and body for a typed body.
Changed AsyncElasticsearch to always be available, regardless of whether aiohttp is installed
Changed exception hierarchy, the major change is a new exception ApiError which differentiates between an error that's raised from the transport layer (previously elasticsearch.exceptions.TransportError, now elastic_transport.TransportError) and one raised from the API layer
Changed the name of JSONSerializer to JsonSerializer for consistency with other serializer names. Added an alias to the old name for backwards compatibility

Removed support for Python 2.7 and Python 3.5, the library now supports only Python 3.6+
Removed the elasticsearch.connection module as all functionality has been moved to the elastic-transport package
Removed the default URL of http://localhost:9200 due to Elasticsearch 8.0 default configuration being https://localhost:9200.
The client's connection to Elasticsearch now must be specified with scheme, host, and port or with the cloud_id parameter
Removed the ability to use positional arguments with API methods. Going forward all API parameters must be keyword-only parameters

Deprecated the body and params parameters on all APIs
Deprecated setting transport options http_auth, api_key, ignore, request_timeout, headers, and opaque_id
All of these settings should instead be set via the .options() method
Deprecated the elasticsearch.transport and elasticsearch.client modules. These modules will be removed in a future version

Removed the doc_type and include_type_name parameters from many document and index APIs

Removed the deprecated local parameter from the cat.indices, cat.nodes, cat.shards API
Removed the deprecated allow_no_datafeeds parameter from the cat.ml_datafeeds API
Removed the deprecated allow_no_jobs parameter from the cat.ml_jobs API
Removed the deprecated size parameter from the cat.thread_pool API
Added the time parameter to the cat.thread_pool API

Removed the deprecated allow_no_jobs parameter from the ml.close_job API
Added the timeout parameter to the ml.delete_trained_model API
Removed the deprecated ml.find_text_structure API
Removed the deprecated allow_no_datafeeds parameter from the ml.get_datafeed_stats API
Removed the deprecated allow_no_datafeeds parameter from the ml.get_datafeeds API
Removed the deprecated allow_no_jobs parameter from the ml.get_job_stats API
Removed the deprecated allow_no_jobs parameter from the ml.get_jobs API
Removed the deprecated allow_no_jobs parameter from the ml.get_overall_buckets API
Added the experimental ml.infer_trained_model_deployment API
Added the experimental ml.put_trained_model_definition_part API
Added the experimental ml.put_trained_model_vocabulary API
Added the experimental ml.start_trained_model_deployment API
Added the experimental ml.stop_trained_model_deployment API