fix pinecone data filter name (#372)

Author: linancn

datastore/providers/pinecone_datastore.py

@@ -232,11 +232,11 @@ def _get_pinecone_filter(
  for field, value in filter.dict().items():
  if value is not None:
  if field == "start_date":
- pinecone_filter["date"] = pinecone_filter.get("date", {})
- pinecone_filter["date"]["$gte"] = to_unix_timestamp(value)
+ pinecone_filter["created_at"] = pinecone_filter.get("created_at", {})
+ pinecone_filter["created_at"]["$gte"] = to_unix_timestamp(value)
  elif field == "end_date":
- pinecone_filter["date"] = pinecone_filter.get("date", {})
- pinecone_filter["date"]["$lte"] = to_unix_timestamp(value)
+ pinecone_filter["created_at"] = pinecone_filter.get("created_at", {})
+ pinecone_filter["created_at"]["$lte"] = to_unix_timestamp(value)
  else:
  pinecone_filter[field] = value