Unexpected exception [_license] error

Hello, everyone! We have strange error in our elasticsearch log:

[2020-11-20T15:41:59,294][ERROR][c.a.o.s.f.OpenDistroSecurityFilter] [<node_name>] Unexpected exception [_license] InvalidIndexNameException[Invalid index name [_license], must not start with '_'.]
org.elasticsearch.indices.InvalidIndexNameException: Invalid index name [_license], must not start with '_'.

Seems that index which would contain "_license" string in its name doesn't exists. Does anyone know how to deal with this?

You are trying to connect I guess an elastic tool like beats, ... with OpenDistro which is not elastic distribution.

I believe this message comes from here. But may be you should tell what your architecture is so we can confirm...

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