deps: Update version.elasticsearch7 to v7.17.21 (main)

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
org.elasticsearch.plugin:parent-join-client	7.17.20 -> 7.17.21
org.elasticsearch:elasticsearch-core	7.17.20 -> 7.17.21
org.elasticsearch:elasticsearch	7.17.20 -> 7.17.21
org.elasticsearch:elasticsearch-x-content	7.17.20 -> 7.17.21
org.elasticsearch.client:elasticsearch-rest-high-level-client	7.17.20 -> 7.17.21

---

[!WARNING] Some dependencies could not be looked up. Check the Dependency Dashboard for more information.

---

Configuration

📅 Schedule: Branch creation - At any time (no schedule defined), Automerge - At any time (no schedule defined).

🚦 Automerge: Enabled.

♻ Rebasing: Whenever PR becomes conflicted, or you tick the rebase/retry checkbox.

🔕 Ignore: Close this PR and you won't be reminded about these updates again.

---

• [ ] If you want to rebase/retry this PR, check this box

---

This PR has been generated by Mend Renovate. View repository job log here.

[github-actions[bot]]

Operate Test Results

778 tests  ±0   763 :white_check_mark: ±0   15m 29s :stopwatch: + 1m 37s 130 suites ±0    15 :zzz: ±0  130 files   ±0     0 :x: ±0 

Results for commit 69160a28. ± Comparison against base commit 668cf6bd.