Update beats framework to 33e323cd6200

[simitt]

Motivation/summary

Update to latest beats changes 33e323cd6200. This deprecates agent.hostname and changes its type from keyword to an alias to agent.name. It also changes the alias from beat.hostname to point to agent.name.
APM Server doesn't use agent.hostname nor beat.hostname so the changes should not affect anything.
Changes will stay in master and not be backported to 7.x, see elastic/beats#18328.

Checklist

- [ ] I have signed the Contributor License Agreement.
- [ ] I have updated CHANGELOG.asciidoc

I have considered changes for:

• documentation
• logging (add log lines, choose appropriate log selector, etc.)
• metrics and monitoring (create issue for Kibana team to add metrics to visualizations, e.g. Kibana#44001)
• automated tests (add tests for the code changes, all unit tests pass locally)
• telemetry
• Elasticsearch Service (https://cloud.elastic.co)
• Elastic Cloud Enterprise (https://www.elastic.co/products/ece)
• Elastic Cloud on Kubernetes (https://www.elastic.co/elastic-cloud-kubernetes)

How to test these changes

Related issues

[apmmachine]

💚 Build Succeeded

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Build stats

• Build Cause: [Pull request #3819 opened]

• Start Time: 2020-05-26T07:11:42.521+0000

• Duration: 44 min 13 sec

Test stats 🧪

Test	Results
Failed	0
Passed	3227
Skipped	145
Total	3372

Steps errors

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• Name: Test Sync

  • Description: ./script/jenkins/sync.sh

  • Duration: 3 min 6 sec

  • Start Time: 2020-05-26T07:21:50.555+0000

  • log