Remove incorrect ES field

[matschaffer]

What does this PR do?

Removes elasticsearch.node_stats.indices.bulk.avg_time.bytes

Why is it important?

The field doesn't exist in https://github.com/klacabane/elasticsearch/blob/fede65858555e4106027b7498f6dfda85df87c8e/x-pack/plugin/core/src/main/resources/monitoring-es-mb.json, isn't populated by the module code, also doesn't make sense that we'd have bytes under a time grouping.

Checklist

• My code follows the style guidelines of this project
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have made corresponding change to the default configuration files
• I have added tests that prove my fix is effective or that my feature works
• I have added an entry in CHANGELOG.next.asciidoc or CHANGELOG-developer.next.asciidoc.

How to test this PR locally

Set up from-source monitoring

Run the Elasticsearch module in default mode

http.enabled: true
http.host: "0.0.0.0"

metricbeat.modules:
  - module: elasticsearch
    period: 10s
    hosts:
      - "localhost:9200"
    username: "elastic"
    password: "changeme"

  - module: kibana
    basepath: "/ftw"
    period: 10s
    hosts: [ "localhost:5601" ]
    username: "elastic"
    password: "changeme"

output.elasticsearch:
  hosts: [ "localhost:9200" ]
  username: "elastic"
  password: "changeme"

Note lack of elasticsearch > node > stats > indices > bulk > avg_time > bytes in mappings.

Related issues

Closes #33211

Use cases

Using the elasticsearch metricbeat module to monitor elasticsearch in non-xpack mode.

[mergify]

This pull request does not have a backport label.
If this is a bug or security fix, could you label this PR @matschaffer? 🙏.
For such, you'll need to label your PR with:

• The upcoming major version of the Elastic Stack
• The upcoming minor version of the Elastic Stack (if you're not pushing a breaking change)

To fixup this pull request, you need to add the backport labels for the needed
branches, such as:

• backport-v8./d.0 is the label to automatically backport to the 8./d branch. /d is the digit

[elasticmachine]

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Build stats

• Start Time: 2022-10-11T02:30:56.531+0000

• Duration: 49 min 38 sec

Test stats 🧪

Test	Results
Failed	0
Passed	3883
Skipped	884
Total	4767

💚 Flaky test report

Tests succeeded.

🤖 GitHub comments

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[mergify]

This pull request is now in conflicts. Could you fix it? 🙏
To fixup this pull request, you can check out it locally. See documentation: https://help.github.com/articles/checking-out-pull-requests-locally/

git fetch upstream
git checkout -b 33211-update-es-mappings upstream/33211-update-es-mappings
git merge upstream/main
git push upstream 33211-update-es-mappings

[Kerry350]

LGTM 👍