used the Response class from fastapi.responses and set the input for status_code to 200

src/khoj/routers/api.py

@@ -862,3 +862,7 @@ async def extract_references_and_questions(
         compiled_references = [item.additional["compiled"] for item in result_list]
 
     return compiled_references, inferred_queries, defiltered_query
+
+@app.get("/health")
+async def health_check():
+    return Response(status_code=200)