[9.1] move language examples to a separate file (#4910)

[pquentin]

Backport

This will backport the following commits from main to 9.1:

• move language examples to a separate file (#4910)

Questions ?

Please refer to the Backport tool documentation

[github-actions]

Following you can find the validation changes against the target branch for the APIs.

API	Status	Request	Response
cluster.allocation_explain	🟢	6/6 → 4/4	6/6 → 4/4
cluster.health	🟢	207/207 → 175/175	207/207 → 175/175
cluster.put_component_template	🔴	32/36 → 30/34	36/36 → 34/34
cluster.state	🟢	83/83 → 79/79	82/82 → 78/78
esql.query	🟢	323/323 → 320/320	0/0
ilm.explain_lifecycle	🔴 → 🟢	5/5	4/5 → 5/5
indices.create	🔴	1302/1336 → 1273/1311	1336/1336 → 1311/1311
indices.create_data_stream	🟢	118/118 → 116/116	118/118 → 116/116
indices.delete	🟢	114/114 → 113/113	114/114 → 113/113
indices.flush	🟢	50/50 → 49/49	50/50 → 49/49
indices.forcemerge	🟢	14/14 → 13/13	14/14 → 13/13
indices.get_data_stream	🔴	119/119 → 115/115	75/119 → 71/115
indices.get_field_mapping	🟢	26/26 → 18/18	26/26 → 18/18
indices.get_mapping	🔴	213/213 → 203/203	203/213 → 193/203
indices.put_index_template	🔴	126/149 → 124/147	149/149 → 147/147
indices.put_mapping	🔴	140/143 → 138/143	146/146
indices.refresh	🟢	313/313 → 301/301	313/313 → 301/301
indices.rollover	🔴	54/54 → 52/52	2/54 → 2/52
ingest.simulate	🟢	12/12 → 10/10	12/12 → 10/10
nodes.info	🟢	116/116 → 112/112	116/116 → 112/112
synonyms.get_synonyms_sets	🟢	7/7 → 6/6	7/7 → 6/6
synonyms.put_synonym	🟢	32/32 → 31/31	32/32 → 31/31
watcher.ack_watch	🟢	6/6 → 1/1	6/6 → 1/1
watcher.activate_watch	🟢	3/3 → 1/1	3/3 → 1/1
watcher.deactivate_watch	🟢	3/3 → 1/1	3/3 → 1/1
watcher.delete_watch	🟢	11/11 → 2/2	11/11 → 2/2
watcher.execute_watch	🔴 → 🟢	41/62 → 7/7	8/62 → 7/7
watcher.get_settings	🟢 → ⚪	4/4 → Missing test	4/4 → Missing test
watcher.get_watch	🔴 → 🟢	46/46 → 9/9	43/46 → 9/9
watcher.put_watch	🔴	75/91 → 29/38	91/91 → 38/38
watcher.query_watches	🔴 → ⚪	1/1 → Missing test	0/1 → Missing test
watcher.start	🟢	3/3 → 1/1	3/3 → 1/1
watcher.stats	🟢	7/7 → 1/1	7/7 → 1/1
watcher.stop	🟢	2/2 → 1/1	2/2 → 1/1
watcher.update_settings	🔴 → ⚪	0/3 → Missing test	3/3 → Missing test
xpack.usage	🔴	43/43 → 41/41	1/39 → 2/37

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