refactor(api): type indexing result with IndexingResultDict TypedDict (#34672)

api/core/workflow/nodes/knowledge_index/protocols.py

@@ -1,9 +1,19 @@
 from collections.abc import Mapping
-from typing import Any, Protocol
+from typing import Any, Protocol, TypedDict
 
 from pydantic import BaseModel, Field
 
 
+class IndexingResultDict(TypedDict):
+    dataset_id: str
+    dataset_name: str
+    batch: Any
+    document_id: str
+    document_name: str
+    created_at: float
+    display_status: str
+
+
 class PreviewItem(BaseModel):
     content: str | None = Field(default=None)
     child_chunks: list[str] | None = Field(default=None)
@@ -34,7 +44,7 @@ class IndexProcessorProtocol(Protocol):
         chunks: Mapping[str, Any],
         batch: Any,
         summary_index_setting: dict | None = None,
-    ) -> dict[str, Any]: ...
+    ) -> IndexingResultDict: ...
 
     def get_preview_output(
         self, chunks: Any, dataset_id: str, document_id: str, chunk_structure: str, summary_index_setting: dict | None