[8.15](backport #40338) Document updated default for output.elasticsearch.allow_older_versions
#40346
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In the Elasticsearch output page for each of the Beats, the "Compatibility" section notes that you can only connect to Elasticsearch instances at the same or a newer version as the Beat. The default behaviour is changed via #36884 so this updates the Beats docs accordingly:
Rel: elastic/ingest-docs#1135
Related Fleet & Agent docs PR: elastic/ingest-docs#1205
This is an automatic backport of pull request #40338 done by [Mergify](https://mergify.com).