Refactor RedisComponent to handle existing index in Redis

src/backend/langflow/components/vectorstores/Redis.py

@@ -1,11 +1,11 @@
-from typing import Optional, List, Union
-from langflow import CustomComponent
+from typing import Optional, Union
 
 from langchain.embeddings.base import Embeddings
-from langchain.schema import BaseRetriever
-from langchain.schema import Document
 from langchain_community.vectorstores import VectorStore
 from langchain_community.vectorstores.redis import Redis
+from langchain_core.documents import Document
+from langchain_core.retrievers import BaseRetriever
+
 from langflow import CustomComponent
 
 
@@ -57,10 +57,19 @@ class RedisComponent(CustomComponent):
         Returns:
         - VectorStore: The Vector Store object.
         """
-
-        return Redis.from_documents(
-            documents=documents,  # type: ignore
-            embedding=embedding,
-            redis_url=redis_server_url,
-            index_name=redis_index_name,
-        )
+        if documents is None:
+            redis_vs = Redis.from_existing_index(
+                embedding=embedding,
+                index_name=redis_index_name,
+                schema=None,
+                key_prefix=None,
+                redis_url=redis_server_url,
+            )
+        else:
+            redis_vs = Redis.from_documents(
+                documents=documents,  # type: ignore
+                embedding=embedding,
+                redis_url=redis_server_url,
+                index_name=redis_index_name,
+            )
+        return redis_vs