Update asynchronous_search descriptions

[Naarcha-AWS]

Description

Describe what this change achieves.

Issues Resolved

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[github-actions]

Changes Analysis

Commit SHA: 4a9244f
Comparing To SHA: 7e4e18e

API Changes

Summary

└─┬Paths
  ├─┬/_opendistro/_asynchronous_search
  │ └─┬POST
  │   ├─┬Parameters
  │   │ └──[🔀] description (14826:20)
  │   ├─┬Parameters
  │   │ └──[🔀] description (14832:20)
  │   └─┬Parameters
  │     └──[🔀] description (14844:20)
  └─┬/_plugins/_asynchronous_search
    └─┬POST
      ├─┬Parameters
      │ └──[🔀] description (14832:20)
      ├─┬Parameters
      │ └──[🔀] description (14844:20)
      └─┬Parameters
        └──[🔀] description (14826:20)

Document Element	Total Changes	Breaking Changes
paths	6	0

• Total Changes: 6
• Modifications: 6

Report

The full API changes report is available at: https://github.com/opensearch-project/opensearch-api-specification/actions/runs/12020231024/artifacts/2235860741

API Coverage

	Before	After	Δ
Covered (%)	599 (58.67 %)	599 (58.67 %)	0 (0 %)
Uncovered (%)	422 (41.33 %)	422 (41.33 %)	0 (0 %)
Unknown	42	42	0

[github-actions]

Spec Test Coverage Analysis

Total	Tested
528	385 (72.92 %)

[dblock]

Looks like Vale is rightfully unhappy.

[Naarcha-AWS]

Pulled the descriptions from docs that have been reviewed by editorial. I'll make Vale happy really fast.

[Naarcha-AWS]

@dblock: This is ready to merge.