Fix: _update_by_query with a term.

[dblock]

Description

The {index}/_update_by_query API also can take an arbitrary term per the docs.

What's the right fix for this? Removing additionalProperties with TermQuery doesn't seem right, but I'm not sure how to turn TermQuery into something generic at the same time as not.

          additionalProperties:
            $ref: '#/components/schemas/TermQuery'

Issues Resolved

List any issues this PR will resolve, e.g. Closes [...].

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[github-actions]

Spec Test Coverage Analysis

Total	Tested
524	118 (22.52 %)

[github-actions]

Changes Analysis

Commit SHA: e7af2d6
Comparing To SHA: aec3145

API Changes

Summary

└─┬Components
  ├─┬_common:ScriptBase
  │ └─┬params
  │   └──[🔀] additionalProperties (27877:33)❌ 
  └─┬_common.query_dsl:QueryContainer
    └─┬term
      └─┬Schema
        └──[🔀] $ref (36451:13)❌ 

Document Element	Total Changes	Breaking Changes
components	2	2

• ❌ BREAKING Changes: 2 out of 2
• Modifications: 2
• Breaking Modifications: 2

Report

The full API changes report is available at: https://github.com/opensearch-project/opensearch-api-specification/actions/runs/10149247240/artifacts/1752066459

API Coverage

	Before	After	Δ
Covered (%)	500 (48.97 %)	500 (48.97 %)	0 (0 %)
Uncovered (%)	521 (51.03 %)	521 (51.03 %)	0 (0 %)
Unknown	24	24	0