Invalid index name [_security], must not start with '_', '-', or '+'

Elastic Stack Elasticsearch
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Elasticsearch version :6.3.0

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This is available from 6.8 or 7.9 with a basic free license. Upgrading is my first advice.

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Also, in 6.3, the API endpoint was different : https://www.elastic.co/guide/en/elasticsearch/reference/6.3/security-api-put-user.html

But as @dadoonet said, do update to a recent version please

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Do you have to work with kibana and elasticsearch in the same version?
I can not pass if it is noon :frowning:

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Yes. You must the same version.

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Then I can't upgrade :frowning:
Do you have any other solution? To register an external user, a request must be made.

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I shared the same above.
did not you see ?

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You posted the docs page for version 7.9 while you are using version 6.3. I shared the docs page for version 6.3 that illustrates that you should be using a different API endpoint because back in 6.3, the endpoint was different.

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Thank you very much.
Worked