Can't use filtering negation

I have a problem with filtering negation. It not return anything when get a result,but when I remove '!' out.It works properly.So,I want to know if this filter is still working.
Thank you

Hi @BestBenjamin
Can you tell us where you are trying to do the query?
And if possible, you could also try to forward the query.

Thank you

Sorry, my bad.I use Elastic App search ,but I read site-search documentation >0<. Now, I can fix it. Thanks

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