[BUG] When calling Opensearch Bulk API, host and port are called in a non-combined form.

[fast-coding]

What is the bug?

As stated in the official document, errors occur in host and port when creating the Client.
https://opensearch.org/docs/latest/clients/python-low-level/

client = OpenSearch(
    hosts = [{'host': host, 'port': 443}],

How can one reproduce the bug?

import boto3
from requests_aws4auth import AWS4Auth
from opensearchpy import OpenSearch, RequestsHttpConnection, AWSV4SignerAuth

host = '<opensearch_domain>/_bulk'
region = 'ap-northeast-2'  
service = 'es'
credentials = boto3.Session().get_credentials()
awsauth = AWSV4SignerAuth(credentials, region, service)

index = 'movies'
datatype = '_doc'

client = OpenSearch(
    # hosts=[{"host": host, "port": 9200}],
    hosts=[host+"9200"],
    http_auth=awsauth,
    use_ssl=True,
    verify_certs=True,
    connection_class = RequestsHttpConnection,
    pool_maxsize = 20
)
movies = '{ "index" : { "_index" : "movies", "_id" : "2" } } \n { "title" : "Interstellar", "director" : "Christopher Nolan", "year" : "2014"} \n { "create" : { "_index" : "movies", "_id" : "3" } } \n { "title" : "Star Trek Beyond", "director" : "Justin Lin", "year" : "2015"} \n { "update" : {"_id" : "3", "_index" : "movies" } } \n { "doc" : {"year" : "2016"} }'

client.bulk(movies)

Error

requests.exceptions.InvalidURL: Failed to parse: https://[<opensearch_domain>/_bulk]:9200/_bulk

What is the expected behavior?

I re-set the host in the following format and it works normally.

client = OpenSearch(
    hosts=[host+"9200"],
    http_auth=awsauth,

Do you have any additional context?

In summary, it seems that when i create the Opensearch client, i need to create the host and port as a string and then put it in the list.
However, the official document says that i need to save it in dictionary form in the list. Please check this part to fix the bug.