Fix Bulk Helpers link of Python

[mhihasan]

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[cla-checker-service]

❌ Author of the following commits did not sign a Contributor Agreement:
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[github-actions]

Documentation preview:

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[elasticsearchmachine]

Pinging @elastic/es-docs (Team:Docs)

[leemthompo]

Thanks for the fix @mhihasan! Can you sign the contribution agreement so we can get this merged?

[leemthompo]

run docs-build