Update to latest API spec, update ES test server to use SSL

[swallez]

Update generated code to the latest API specification. This includes elastic/elasticsearch-specification#1823 that fixes #286, fixes #383, fixes #298, fixes #264, fixes #353, fixes fixes #282, fixes #332, fixes #339.

Also updates ElasticsearchTestServer to use SSL with ES 8.x

[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-384-to-7.17
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick --mainline 1 01320ec2be4ca2a183bcc2ababe4daed0ae13b81
# Push it to GitHub
git push --set-upstream origin backport-384-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-384-to-7.17.

[github-actions]

The backport to 8.4 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-8.4 8.4
# Navigate to the new working tree
cd .worktrees/backport-8.4
# Create a new branch
git switch --create backport-384-to-8.4
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick --mainline 1 01320ec2be4ca2a183bcc2ababe4daed0ae13b81
# Push it to GitHub
git push --set-upstream origin backport-384-to-8.4
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-8.4

Then, create a pull request where the base branch is 8.4 and the compare/head branch is backport-384-to-8.4.