Fix knowledge_graph_kwd on infinity. Close #6476 and #6624 (#6651)

### What problem does this PR solve?

Fix knowledge_graph_kwd on infinity. Close #6476 and #6624

### Type of change

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

api/db/services/document_service.py

         cls.clear_chunk_num(doc.id)
         try:
             settings.docStoreConn.delete({"doc_id": doc.id}, search.index_name(tenant_id), doc.kb_id)
-            settings.docStoreConn.update({"kb_id": doc.kb_id, "knowledge_graph_kwd": ["entity", "relation", "graph", "community_report"], "source_id": doc.id},
+            settings.docStoreConn.update({"kb_id": doc.kb_id, "knowledge_graph_kwd": ["entity", "relation", "graph", "subgraph", "community_report"], "source_id": doc.id},
                                          {"remove": {"source_id": doc.id}},
                                          search.index_name(tenant_id), doc.kb_id)
             settings.docStoreConn.update({"kb_id": doc.kb_id, "knowledge_graph_kwd": ["graph"]},
                                          {"removed_kwd": "Y"},
                                          search.index_name(tenant_id), doc.kb_id)
-            settings.docStoreConn.delete({"kb_id": doc.kb_id, "knowledge_graph_kwd": ["entity", "relation", "graph", "community_report"], "must_not": {"exists": "source_id"}},
+            settings.docStoreConn.delete({"kb_id": doc.kb_id, "knowledge_graph_kwd": ["entity", "relation", "graph", "subgraph", "community_report"], "must_not": {"exists": "source_id"}},
                                          search.index_name(tenant_id), doc.kb_id)
         except Exception:
             pass

conf/infinity_mapping.json

 	"create_time": {"type": "varchar", "default": ""},
 	"create_timestamp_flt": {"type": "float", "default": 0.0},
 	"img_id": {"type": "varchar", "default": ""},
-	"docnm_kwd": {"type": "varchar", "default": "", "analyzer": "whitespace"},
+	"docnm_kwd": {"type": "varchar", "default": ""},
 	"title_tks": {"type": "varchar", "default": "", "analyzer": "whitespace"},
 	"title_sm_tks": {"type": "varchar", "default": "", "analyzer": "whitespace"},
 	"name_kwd": {"type": "varchar", "default": "", "analyzer": "whitespace-#"},
 	"rank_int": {"type": "integer", "default": 0},
 	"rank_flt": {"type": "float", "default": 0},
 	"available_int": {"type": "integer", "default": 1},
-	"knowledge_graph_kwd": {"type": "varchar", "default": "", "analyzer": "whitespace-#"},
+	"knowledge_graph_kwd": {"type": "varchar", "default": ""},
 	"entities_kwd": {"type": "varchar", "default": "", "analyzer": "whitespace-#"},
 	"pagerank_fea": {"type": "integer", "default":  0},
 	"tag_feas": {"type": "varchar", "default":  ""},

rag/utils/infinity_conn.py

 
     def field_keyword(self, field_name: str):
         # The "docnm_kwd" field is always a string, not list.
-        if field_name == "source_id" or (field_name.endswith("_kwd") and field_name != "docnm_kwd"):
+        if field_name == "source_id" or (field_name.endswith("_kwd") and field_name != "docnm_kwd" and field_name != "knowledge_graph_kwd"):
             return True
         return False