Use a version placeholder in doc_ids table

[delvedor]

As titled.
This will solve backporting issues, but unfortunately, we can't automatically add the version in the output json, otherwise, we will have again the backporting issue.
The URL updating needs to be demanded to code generators.

[lcawl]

Depending on where this is resolved, {version} might be a problematic choice, since we already use that as an attribute for the full version.release.modifier in our documentation (e.g. see https://github.com/elastic/docs/blob/master/shared/versions/stack/8.1.asciidoc). What we currently use in the documentation builds for just version.release is {branch}. Should we use the same placeholders here?

[delvedor]

@lcawl done! :)

[lcawl]

Thanks! LGTM

[github-actions]

The backport to 8.0 failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-8.0 8.0
# Navigate to the new working tree
cd .worktrees/backport-8.0
# Create a new branch
git switch --create backport-1570-to-8.0
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick --mainline 1 f300b0102ae6c4aef871f15bae66ad7aeba7da45
# Push it to GitHub
git push --set-upstream origin backport-1570-to-8.0
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-8.0

Then, create a pull request where the base branch is 8.0 and the compare/head branch is backport-1570-to-8.0.

[github-actions]

The backport to 8.1 failed:

The process '/usr/bin/git' failed with exit code 1

To backport manually, run these commands in your terminal:

# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add .worktrees/backport-8.1 8.1
# Navigate to the new working tree
cd .worktrees/backport-8.1
# Create a new branch
git switch --create backport-1570-to-8.1
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick --mainline 1 f300b0102ae6c4aef871f15bae66ad7aeba7da45
# Push it to GitHub
git push --set-upstream origin backport-1570-to-8.1
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-8.1

Then, create a pull request where the base branch is 8.1 and the compare/head branch is backport-1570-to-8.1.