OpenSource Resume is supported only with Elasticsearch. (#14233)

### What problem does this PR solve?

OpenSource Resume is supported only with Elasticsearch.

### Type of change

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

rag/app/resume.py

@@ -39,6 +39,8 @@ from io import BytesIO
 from typing import Optional
 import numpy as np
 
+from common import settings
+
 # tiktoken for long random string filtering (ref: SmartResume should_remove strategy)
 try:
     import tiktoken
@@ -2485,6 +2487,9 @@ def chunk(filename, binary, tenant_id, from_page=0, to_page=100000,
     if callback is None:
         def callback(prog, msg): return None
 
+    if settings.DOC_ENGINE.lower() != "elasticsearch":
+        raise Exception("Resume is supported only with Elasticsearch.")
+
     try:
         callback(0.1, "Starting resume parsing...")