Saved Object: Internal Server Error

Firstly, there are around 7 saved objects, I was trying to import a new object pattern, with the existing one object, but removed a few criteria,
Then the import has failed, and all the saved objects were missing.

Then suddenly, the saved object page has prompt this below error.

F12 entered.

Tried to restart the elasticsearch.service still wont help.

Any advice to undo the error?

The elasticsearch version is 7.17.2

from kibana.log

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