Update app.py

app.py

@@ -20,12 +20,9 @@ graph = Neo4jGraph(
     password="_x8f-_aAQvs2NB0x6s0ZHSh3W_y-HrENDbgStvsUCM0"
 )
 
-# Create an instance of OpenAI embeddings
-embedding = OpenAIEmbeddings(api_key=os.environ['OPENAI_API_KEY'])
-
 # Initialize the vector index with Neo4j
 vector_index = Neo4jVector.from_existing_graph(
-    embeddings=embedding,
+    OpenAIEmbeddings(api_key=os.environ['OPENAI_API_KEY']),
     graph=graph,
     search_type="hybrid",
     node_label="Document",