fix: AsyncQueryResponse's body should be AsyncEsqlResult and not EsqlResult

[pawankartik-elastic]

Based on the documentation here: https://www.elastic.co/guide/en/elasticsearch/reference/current/esql-async-query-api.html#esql-async-query-api-response-body, async query response's body type should be AsyncEsqlResult rather than EsqlResult. This allows accounting for the id and is_running details that are returned by the API.

[github-actions]

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

API	Status	Request	Response
esql.async_query	⚪	Missing test	Missing test

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

[github-actions]

The backport to 8.x 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.x 8.x
# Navigate to the new working tree
cd .worktrees/backport-8.x
# Create a new branch
git switch --create backport-4257-to-8.x
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 fea1bf8d8b64746cf69d5dd21412e2d0ee666876
# Push it to GitHub
git push --set-upstream origin backport-4257-to-8.x
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-8.x

Then, create a pull request where the base branch is 8.x and the compare/head branch is backport-4257-to-8.x.

[github-actions]

The backport to 8.17 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-8.17 8.17
# Navigate to the new working tree
cd .worktrees/backport-8.17
# Create a new branch
git switch --create backport-4257-to-8.17
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 fea1bf8d8b64746cf69d5dd21412e2d0ee666876
# Push it to GitHub
git push --set-upstream origin backport-4257-to-8.17
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-8.17

Then, create a pull request where the base branch is 8.17 and the compare/head branch is backport-4257-to-8.17.

[github-actions]

The backport to 8.18 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-8.18 8.18
# Navigate to the new working tree
cd .worktrees/backport-8.18
# Create a new branch
git switch --create backport-4257-to-8.18
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 fea1bf8d8b64746cf69d5dd21412e2d0ee666876
# Push it to GitHub
git push --set-upstream origin backport-4257-to-8.18
# Go back to the original working tree
cd ../..
# Delete the working tree
git worktree remove .worktrees/backport-8.18

Then, create a pull request where the base branch is 8.18 and the compare/head branch is backport-4257-to-8.18.

[l-trotta]

took a look at the state of esql.async in the 8.x, 8.18, 8.17 branches and decided not to backport, the main reason we defined async response types is for docs purposes, while clients will handle the result in the generators, so the important thing is that this is in main and 9.0. also we're missing other backports from old PRs, so skipping this backport too.