fix: remove unnecessary db_index from content field in models

--bug=1058812 --user=刘瑞斌 【知识库】多选问题批量关联分段，向量数据没有关联，导致向量检索结果为空 https://www.tapd.cn/62980211/s/1732046

Author: liuruibin

apps/common/event/listener_manage.py

@@ -153,7 +153,7 @@ def is_the_task_interrupted():
     @staticmethod
     def embedding_by_data_list(data_list: List, embedding_model: Embeddings):
         # 批量向量化
-        VectorStore.get_embedding_vector().batch_save(data_list, embedding_model, lambda: True)
+        VectorStore.get_embedding_vector().batch_save(data_list, embedding_model, lambda: False)
 
     @staticmethod
     def get_embedding_paragraph_apply(embedding_model, is_the_task_interrupted, post_apply=lambda: None):