Remove setting index.optimize_auto_generated_id (#27583)

[liketic]

Closes #27583

[elasticmachine]

Since this is a community submitted pull request, a Jenkins build has not been kicked off automatically. Can an Elastic organization member please verify the contents of this patch and then kick off a build manually?

[jasontedor]

I am pretty sure this is not enough. This setting can be on indices created in 6.x and we will support them in 7.x.

[s1monw]

@jasontedor why can't we remove it? it will just be archived since you never pushed #26995 maybe I miss something

[s1monw]

@elasticmachine ok to test

[liketic]

Thanks for your review. I can address @jasontedor 's comments by deprecating the setting index.optimize_auto_generated_id and reject it for 7.x instead if needed. 👍

[liketic]

Hi @jasontedor Shall I update the PR by deprecating the setting? 👍 Thanks very much!

[jasontedor]

@liketic Yes, here is what we need to do:

• deprecate in 6.x (one PR)
• prevent the ability to modify this setting on indices created since 7.0.0 (another PR)
• remove this setting completely in 8.0.0 (this PR)

[elasticmachine]

Since this is a community submitted pull request, a Jenkins build has not been kicked off automatically. Can an Elastic organization member please verify the contents of this patch and then kick off a build manually?

[liketic]

Thanks @jasontedor . I opened #28862 for the first one.

[liketic]

And #28895 for the second one.

[jasontedor]

@liketic Now that 7.0 and 7.x are branched from master and #28895 is integrated, we can get this change in. Can you bring this change up to date with the master branch?

[liketic]

@jasontedor Please review again.

[jasontedor]

@elasticmachine test this please

[jasontedor]

LGTM.

[jasontedor]

Thanks @liketic.