diff --git a/api/core/workflow/nodes/knowledge_index/entities.py b/api/core/workflow/nodes/knowledge_index/entities.py
index 2a2e983a0..c79373afd 100644
--- a/api/core/workflow/nodes/knowledge_index/entities.py
+++ b/api/core/workflow/nodes/knowledge_index/entities.py
@@ -63,7 +63,7 @@ class RetrievalSetting(BaseModel):
     Retrieval Setting.
     """
 
-    search_method: Literal["semantic_search", "keyword_search", "fulltext_search", "hybrid_search"]
+    search_method: Literal["semantic_search", "keyword_search", "full_text_search", "hybrid_search"]
     top_k: int
     score_threshold: float | None = 0.5
     score_threshold_enabled: bool = False
diff --git a/api/services/entities/knowledge_entities/rag_pipeline_entities.py b/api/services/entities/knowledge_entities/rag_pipeline_entities.py
index ac96b5c8a..860bfde40 100644
--- a/api/services/entities/knowledge_entities/rag_pipeline_entities.py
+++ b/api/services/entities/knowledge_entities/rag_pipeline_entities.py
@@ -83,7 +83,7 @@ class RetrievalSetting(BaseModel):
     Retrieval Setting.
     """
 
-    search_method: Literal["semantic_search", "fulltext_search", "keyword_search", "hybrid_search"]
+    search_method: Literal["semantic_search", "full_text_search", "keyword_search", "hybrid_search"]
     top_k: int
     score_threshold: float | None = 0.5
     score_threshold_enabled: bool = False