docs(zilliz): connection_args add token description for serverless cl… (#7810)

Description:

Currently, Zilliz only support dedicated clusters using a pair of
username and password for connection. Regarding serverless clusters,
they can connect to them by using API keys( [ see official note
detail](https://docs.zilliz.com/docs/manage-cluster-credentials)), so I
add API key(token) description in Zilliz docs to make it more obvious
and convenient for this group of users to better utilize Zilliz. No
changes done to code.

---------

Co-authored-by: Robin.Wang <3Jg$94sbQ@q1>
Co-authored-by: Bagatur <baskaryan@gmail.com>

docs/extras/modules/data_connection/vectorstores/integrations/zilliz.ipynb

@@ -65,7 +65,8 @@
     "# replace\n",
     "ZILLIZ_CLOUD_URI = \"\"  # example: \"https://in01-17f69c292d4a5sa.aws-us-west-2.vectordb.zillizcloud.com:19536\"\n",
     "ZILLIZ_CLOUD_USERNAME = \"\"  # example: \"username\"\n",
-    "ZILLIZ_CLOUD_PASSWORD = \"\"  # example: \"*********\""
+    "ZILLIZ_CLOUD_PASSWORD = \"\"  # example: \"*********\"\n",
+    "ZILLIZ_CLOUD_API_KEY = \"\"  # example: \"*********\" (for serverless clusters which can be used as replacements for user and password)"
    ]
   },
   {
@@ -112,6 +113,7 @@
     "        \"uri\": ZILLIZ_CLOUD_URI,\n",
     "        \"user\": ZILLIZ_CLOUD_USERNAME,\n",
     "        \"password\": ZILLIZ_CLOUD_PASSWORD,\n",
+    "        # \"token\": ZILLIZ_CLOUD_API_KEY,  # API key, for serverless clusters which can be used as replacements for user and password\n",
     "        \"secure\": True,\n",
     "    },\n",
     ")"
@@ -174,7 +176,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.12"
+   "version": "3.11.3"
   }
  },
  "nbformat": 4,

langchain/vectorstores/zilliz.py

@@ -50,6 +50,8 @@ class Zilliz(Milvus):
             password are provided, we will add related header in every RPC call.
         password (str): Required when user is provided. The password
             corresponding to the user.
+        token (str): API key, for serverless clusters which can be used as
+            replacements for user and password.
         secure (bool): Default is false. If set to true, tls will be enabled.
         client_key_path (str): If use tls two-way authentication, need to
             write the client.key path.
@@ -76,6 +78,7 @@ class Zilliz(Milvus):
                 "uri": "https://in03-ba4234asae.api.gcp-us-west1.zillizcloud.com",
                 "user": "temp",
                 "password": "temp",
+                "token": "temp", # API key as replacements for user and password
                 "secure": True
             }
             drop_old: True,