List of transport classes that can be used, simply import your choice and pass it to the constructor of ~elasticsearch.Elasticsearch as connection_class. Note that the ~elasticsearch.connection.RequestsHttpConnection requires requests to be installed.
For example to use the requests-based connection just import it and use it:
from elasticsearch import Elasticsearch, RequestsHttpConnection
es = Elasticsearch(connection_class=RequestsHttpConnection)The default connection class is based on urllib3 which is more performant and lightweight than the optional requests-based class. Only use RequestsHttpConnection if you have need of any of requests advanced features like custom auth plugins etc.
Connection
Urllib3HttpConnection
RequestsHttpConnection