Update app.py

app.py

@@ -137,7 +137,7 @@ EMBED_INDEXES = {
         "region": "us-west-2"
     },
     "ada": {
-        "name": "ada-pdf-index",
+        "name": "ada-embeddings",
         "dimension": 1536,
         "region": "us-east-1"
     }