Integration with Infinity (#2894)

### What problem does this PR solve?

Integration with Infinity

- Replaced ELASTICSEARCH with dataStoreConn
- Renamed deleteByQuery with delete
- Renamed bulk to upsertBulk
- getHighlight, getAggregation
- Fix KGSearch.search
- Moved Dealer.sql_retrieval to es_conn.py


### Type of change

- [x] Refactoring

api/settings.py

@@ -18,6 +18,8 @@ from datetime import date
 from enum import IntEnum, Enum
 from api.utils.file_utils import get_project_base_directory
 from api.utils.log_utils import LoggerFactory, getLogger
+import rag.utils.es_conn
+import rag.utils.infinity_conn
 
 # Logger
 LoggerFactory.set_directory(
@@ -33,7 +35,7 @@ access_logger = getLogger("access")
 database_logger = getLogger("database")
 chat_logger = getLogger("chat")
 
-from rag.utils.es_conn import ELASTICSEARCH
+import rag.utils
 from rag.nlp import search
 from graphrag import search as kg_search
 from api.utils import get_base_config, decrypt_database_config
@@ -206,8 +208,12 @@ AUTHENTICATION_DEFAULT_TIMEOUT = 7 * 24 * 60 * 60  # s
 PRIVILEGE_COMMAND_WHITELIST = []
 CHECK_NODES_IDENTITY = False
 
-retrievaler = search.Dealer(ELASTICSEARCH)
-kg_retrievaler = kg_search.KGSearch(ELASTICSEARCH)
+if 'username' in get_base_config("es", {}):
+    docStoreConn = rag.utils.es_conn.ESConnection()
+else:
+    docStoreConn = rag.utils.infinity_conn.InfinityConnection()
+retrievaler = search.Dealer(docStoreConn)
+kg_retrievaler = kg_search.KGSearch(docStoreConn)
 
 
 class CustomEnum(Enum):