update document segment (#950)

Co-authored-by: jyong <jyong@dify.ai>

api/core/indexing_runner.py

@@ -691,6 +691,7 @@ class IndexingRunner:
                 DocumentSegment.status == "indexing"
             ).update({
                 DocumentSegment.status: "completed",
+                DocumentSegment.enabled: True,
                 DocumentSegment.completed_at: datetime.datetime.utcnow()
             })