Optional field id in hit class

[l-trotta]

as the comment just above the field says:

'_id' is not available when using 'stored_fields: _none_'

[github-actions]

Following you can find the validation results for the API you have changed.

API	Status	Request	Response
search	🔴	1433/2083	2016/2065

You can validate this API yourself by using the make validate target.

[github-actions]

The backport to 7.17 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-7.17 7.17
# Navigate to the new working tree
cd .worktrees/backport-7.17
# Create a new branch
git switch --create backport-2592-to-7.17
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 b1f91f1a0ae5d09da92cf0859b0ff92410cdb6e3
# Push it to GitHub
git push --set-upstream origin backport-2592-to-7.17
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-7.17

Then, create a pull request where the base branch is 7.17 and the compare/head branch is backport-2592-to-7.17.