fix: resolve boolean conditional error for es_apt_key in Debian task

[indraguna]

Ansible 2.17+ enforces strict boolean evaluation in when conditionals. The previous condition es_apt_key | string returns a string (the URL value), which causes the following error:

Conditional result (True) was derived from value of type 'str'.
Conditionals must have a boolean result.

Summary by CodeRabbit

Release Notes

• Chores
  • Improved robustness of repository configuration validation logic.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

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Plan: Pro

Run ID: bfd19639-daa5-4106-815e-e589943e6782

📥 Commits

Reviewing files that changed from the base of the PR and between f737a95 and 610d5a0.

📒 Files selected for processing (1)

• tasks/elasticsearch-Debian.yml

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📝 Walkthrough

Walkthrough

An Ansible task conditional in the Elasticsearch Debian configuration file has been modified to enforce stricter validation logic. The change replaces a combined truthy expression with explicit boolean conversion and separate non-empty verification of repository and key variables.

Changes

Cohort / File(s)	Summary
Ansible Task Conditional tasks/elasticsearch-Debian.yml	Tightened the conditional logic for adding Elasticsearch APT repository key by explicitly converting es_add_repository to boolean and separately checking that es_apt_key has a non-empty value instead of relying on a combined truthy expression.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: fixing a boolean conditional error for es_apt_key in the Debian Ansible task, which aligns with the PR's objective to resolve Ansible 2.17+ strict boolean evaluation enforcement.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch fix/resolve_boolean_conditional_error_for_es_apt_key

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