FIX: If chunk["content_with_weight"] contains one or more unpaired surrogate characters (such as incomplete emoji or other special characters), then calling .encode("utf-8") directly will raise a UnicodeEncodeError. (#9246)

FIX: If chunk["content_with_weight"] contains one or more unpaired
surrogate characters (such as incomplete emoji or other special
characters), then calling .encode("utf-8") directly will raise a
UnicodeEncodeError.

### What problem does this PR solve?
### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

rag/svr/task_executor.py

@@ -284,7 +284,7 @@ async def build_chunks(task, progress_callback):
         try:
             d = copy.deepcopy(document)
             d.update(chunk)
-            d["id"] = xxhash.xxh64((chunk["content_with_weight"] + str(d["doc_id"])).encode("utf-8")).hexdigest()
+            d["id"] = xxhash.xxh64((chunk["content_with_weight"] + str(d["doc_id"])).encode("utf-8", "surrogatepass")).hexdigest()
             d["create_time"] = str(datetime.now()).replace("T", " ")[:19]
             d["create_timestamp_flt"] = datetime.now().timestamp()
             if not d.get("image"):