Any one knows how come I see not cached mapping for this field at Kibana dashboard?

I am unsure where they come from? The index has a _type but Kibana also displays type as well. The yellow warning I don't know what exactly they are meaning for? Is there anyone know how they are?

Even I refresh the index pattern at management of Kibana, it still shows me tags as warning.

Thank you!

If you hover your cursor over them you should see what they are about.

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