Update documentation to use ingest_pipeline metricset

[laraMorenoIgle]

As confirmed by Dev in this comment https://github.com/elastic/sdh-beats/issues/4050#issuecomment-1808008624 the metricset name for collecting elasticsearch ingest data should be ingest_pipeline and not ingest.

Proposed commit message

Update configuration example for ingest_pipeline metricset so it includes the right name, since it was wrongly name ingest instead of ingest_pipeline.

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[mergify[bot]]

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

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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

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• Start Time: 2023-11-13T12:11:38.276+0000

• Duration: 8 min 28 sec

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[mergify[bot]]

This pull request does not have a backport label. If this is a bug or security fix, could you label this PR @laraMorenoIgle? 🙏. 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

[mergify[bot]]

backport-8.x has been added to help with the transition to the new branch 8.x. If you don't need it please use backport-skip label and remove the backport-8.x label.

[mergify[bot]]

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 laraMorenoIgle-patch-1 upstream/laraMorenoIgle-patch-1
git merge upstream/main
git push upstream laraMorenoIgle-patch-1