[DOC] document dfm_empty_overrides_all setting in the security plugin

[rursprung]

What do you want to do?

• Request a change to existing documentation
• Add new documentation
• Report a technical problem with the documentation
• Other

Tell us about your request.
the dfm_empty_overrides_all config option introduced in opensearch-project/security#1735 for opensearch-project/security#1572 doesn't seem to be documented (searching for it on opensearch.org does not yield a result). this should be documented.

What other resources are available?
see the original issue for a link to the same feature in Search Guard (the feature was ported 1:1 by floragunn, thus it behaves the same and you might be allowed to copy the documentation as well).
the opensearch-security team should be able to provide further input if needed.

[hdhalter]

Thanks for entering this issue, @rursprung ! Would you be willing to submit a PR for the update in the documentation repo?

[rursprung]

i currently don't have time for this, sorry :(

[hdhalter]

i currently don't have time for this, sorry :(

No worries, we are appreciative of your contributions in any form!

[hdhalter]

@john-eliatra - Can we add this to your list?

[john-eliatra]

Hi @hdhalter , will do.