Add missing shard_min_doc_count to TermsAggregation

[rand0m86]

Adding missing shard_min_doc_count field to terms aggregation.

Closes #2631

[rand0m86]

Made it similar to elastic/elasticsearch-java#319.
@swallez Please take a look.

Ideally, I would like to get this new field in the java client, but I am not sure if this is enough.

[rand0m86]

Pinging @Anaethelion, @davidkyle and @flobernd.
Guys, please take a look at this one.

[pquentin]

I checked that this is the only bucket aggregation that's should have shard_min_doc_count but is missing it.

[rand0m86]

Hi @pquentin, thanks for looking into this!
Can you let me know on the next steps? Like, when it will be merged, when should we expect it in the ES 8 client java library?

[l-trotta]

@rand0m86 it will be in the next version, sorry for the long wait

[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-2175-to-7.17
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 2bb4d0cc61ca56099a1dd4e1dee4bdb1bf7e4362
# Push it to GitHub
git push --set-upstream origin backport-2175-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-2175-to-7.17.

[rand0m86]

@rand0m86 it will be in the next version, sorry for the long wait

Cool, thanks for an update @l-trotta!