fix(graphrag): variable refernence error (#2136)

### What problem does this PR solve?

fix: Use wrong variable in graph rag step.

### Type of change

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


Co-authored-by: 陈晓强 <[email protected]>

graphrag/search.py

@@ -93,9 +93,9 @@ class KGSearch(Dealer):
         s = s.query(bqry)[0: 6]
         s = s.to_dict()
         txt_res = self.es.search(deepcopy(s), idxnm=idxnm, timeout="600s", src=src)
-        txt_ids = self.es.getDocIds(comm_res)
+        txt_ids = self.es.getDocIds(txt_res)
         if merge_into_first(txt_res, "-Original Content-"):
-            txt_ids = comm_ids[0:1]
+            txt_ids = txt_ids[0:1]
 
         return self.SearchResult(
             total=len(ent_ids) + len(comm_ids) + len(txt_ids),