Update connection methods

Signed-off-by: Jael Gu <mengjia.gu@zilliz.com>

es_index.py

@@ -15,21 +15,16 @@ class ESIndex(PyOperator):
     Use bulk to insert docs into ElasticSearch index, using auto id generated.
 
     Args:
-        host (`str`): host to connect ElasticSearch client
-        port (`int`): port to connect ElasticSearch client
-        index_name (`str`): index name to index input docs
-        user (`str=None`): user name to connect ElasticSearch client, defaults to None
-        password (`str=None`): user password to connect ElasticSearch client, defaults to None
-        ca_certs (`str=None`): path to CA certificate, defaults to None
+        **connection_kwargs: For example, host
     """
-    def __init__(self, host: str, port: int, index_name: str, user: str = None, password: str = None, ca_certs: str = None):
+    def __init__(self, index_name: str, **connection_kwargs):
         super().__init__()
         self.index_name = index_name
+        if 'port' in connection_kwargs:
+            assert 'host' in connection_kwargs, 'Missing port in connection kwargs but given port only.'
+            connection_kwargs['hosts'] = [f'https://{host}:{port}']
         try:
-            self.client = Elasticsearch(
-                f'https://{host}:{port}',
-                ca_certs=ca_certs,
-                basic_auth=(user, password))
+            self.client = Elasticsearch(**connection_kwargs)
             logger.info('Successfully connected to ElasticSearch client.')
         except Exception as e:
             logger.error('Failed to connect ElasticSearch client:\n', e)