Mongodb cannot synchronize to elasticsearch when deleting data?

  mongodb, question

Data added and modified in mongodb can be synchronized to ES, but when data is deleted, the deleted data is still stored in ES.
Data in mongodb:
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Data in ES (cannot delete blue line data synchronously):
图片描述

I don’t know how to solve the problem. It seems to be caused by a slight difference between the data synchronization for the first time and the data synchronization for the second time by mongo-connector.