[text-auditor] Fix repeated `Elastisearch` typo in add_fields docs and changelog text

Text Improvements

The following user-facing text issues were found in the repository. Each is a low-effort fix.

1. Repeated product-name typo: Elastisearch → Elasticsearch

Current text: When the event is ingested (e.g. by Elastisearch) the document will have \op_type: "index"` set as a metadata field.`

Suggested fix: When the event is ingested (e.g. by Elasticsearch) the document will have \op_type: "index"` set as a metadata field.`

Why: Clear misspelling of the product name in user-facing documentation.

Verified occurrences (all in-repo matches for Elastisearch):

• libbeat/processors/actions/docs/add_fields.asciidoc (line 55)
• docs/reference/filebeat/add-fields.md (line 53)
• docs/reference/packetbeat/add-fields.md (line 53)
• docs/reference/winlogbeat/add-fields.md (line 53)
• docs/reference/metricbeat/add-fields.md (line 53)
• docs/reference/heartbeat/add-fields.md (line 53)
• docs/reference/auditbeat/add-fields.md (line 53)
• CHANGELOG.asciidoc (line 10350)

Suggested Actions

• Replace Elastisearch with Elasticsearch in all eight verified occurrences listed above.
• If the docs/reference/*/add-fields.md files are generated from shared source text, apply the fix in the source template and regenerate to prevent reintroduction.

[!NOTE]

🔒 Integrity filter blocked 8 items

The following items were blocked because they don't meet the GitHub integrity level.

• #15956 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #10958 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #18542 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #21319 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #1755 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #2926 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #28771 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".
• #26246 search_issues: has lower integrity than agent requires. The agent cannot read data with integrity below "approved".

To allow these resources, lower min-integrity in your GitHub frontmatter:

tools:
  github:
    min-integrity: approved  # merged | approved | unapproved | none

What is this? | From workflow: Text Auditor

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• expires on May 21, 2026, 1:50 PM UTC

Start with libbeat/processors/actions/docs/add_fields.asciidoc and check whether the docs/reference/*/add-fields.md files are generated from it. Update the eight listed occurrences, including CHANGELOG.asciidoc, and verify that searching the repository finds no remaining Elastisearch typo.