Attempt to simplify the cluster configuration.

Since RFC-1738 we have a well defined and standard way to define URI.

Reason why I tried to configure my elasticsearch like so:

    elasticsearch.Elasticsearch([
        'https://admin:password@1.elasticsearch.cloud.com',
        'https://admin:password@2.elasticsearch.cloud.com',
        'http://3.elasticsearch.lan:9200'
    ])

Today the alternative is to write something like:

    elasticsearch.Elasticsearch([
        {'host': '1.elasticsearch.cloud.com', 'port': 443, 'use_ssl': True, 'http_auth': 'admin:password'},
        {'host': '2.elasticsearch.cloud.com', 'port': 443, 'use_ssl': True, 'http_auth': 'admin:password'},
        '3.elasticsearch.lan:9200'
    ])

Do you think it may be interesting to add this way to defined it on a standard way?
The main reason I am asking is that URI are easier to define in a .dot ini file.

I started to add it directly to the project which is using elasticsearch-py[0] but we though it could be better to have it directly here.

Any thoughts?

[0] https://github.com/spiral-project/daybed/pull/267#issuecomment-62804246