Fields Coming as unknown in Index

I am getting unknown fields in .monitoring-es-* Index.

I recently enabled stack monitoring in ELK Stack then I am getting data in .monitoring-* Indices. I wanted to create alerts based on this data but I am unable to use term in one field. I digged more then found field is unknown hence I am not able to use in search queries. Please help me to resolve this issue ?

Index Pattern Screenshot:

Discover Page Screenshot:
Screenshot from 2020-10-20 12-41-23

Getting warning Symbol in fields

I did not find fields even in .es-monitoring-* mapping also. Please help me to resolve this issue.

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