Add false_allow_templates to DynamicMapping

[Truta446]

Description

Adds the false_allow_templates value to the DynamicMapping schema.

OpenSearch's dynamic mapping parameter accepts false_allow_templates (new fields are only indexed when they match a dynamic template, otherwise they are not indexed), but the spec's DynamicMapping enum was missing it — it only listed false, strict, strict_allow_templates, true, and boolean. As a result, generated clients reject the value at the type level even though it works at runtime.

The value was introduced in OpenSearch 3.3.0 (opensearch-project/OpenSearch#19065), so the added integration test case is gated with version: '>= 3.3', mirroring the existing strict_allow_templates case.

Reported downstream in the JS client: .

Issues Resolved

Fixes the missing false_allow_templates value in DynamicMapping.

Changes

• spec/schemas/_common.mapping.yaml: add false_allow_templates to the DynamicMapping string enum.
• tests/default/indices/mapping/mapping.yaml: add an integration test setting dynamic: false_allow_templates (gated >= 3.3).
• CHANGELOG.md: changelog entry.

Check List

• All tests pass (npm run lint:spec passes; npm run merge succeeds and the bundled spec includes the value).
• Updated the CHANGELOG.
• Commits are signed per the DCO using --signoff.

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.