[Backport 8.x] [DOCS] Convert final examples from JSON to YAML

[github-actions]

Backport 4a30d3a from #3692.

[github-actions]

Following you can find the validation results for the APIs you have changed.

API	Status	Request	Response
async_search.delete	🟢	4/4	4/4
async_search.get	🟢	6/6	6/6
async_search.status	🟢	3/3	3/3
async_search.submit	🟢	7/7	7/7
bulk	🟢	445/445	463/463
ccr.delete_auto_follow_pattern	⚪	Missing test	Missing test
ccr.follow_info	⚪	Missing test	Missing test
ccr.follow	⚪	Missing test	Missing test
cluster.health	🟢	159/159	159/159
ingest.put_pipeline	🟢	60/60	60/60
ml.close_job	🟢	64/64	63/63
ml.delete_calendar_event	🟢	4/4	4/4
ml.estimate_model_memory	🟢	16/16	16/16

You can validate these APIs yourself by using the make validate target.