[DOCS#EV-6348] Rename policy activity Elasticsearch index in examples

[tianfeng92]

Product Version(s):

Calico Enterprise v3.23-1

Issue:

Rename the Elasticsearch index in policy activity example.

Link to docs preview:

https://deploy-preview-2497--calico-docs-preview-next.netlify.app/calico-enterprise/next/observability/elastic/policy-activity

SME review:

• An SME has approved this change.

DOCS review:

• A member of the docs team has approved this change.

Additional information:

Merge checklist:

• Deploy preview inspected wherever changes were made
• Build completed successfully
• Test have passed

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