add ccs support for 8.19 and 9.1

[ketkee-aryamane]

DO NOT MERGE THIS PR UNTIL 9.1 / 8.19 RELEASE DAY

Linked to https://github.com/elastic/developer-docs-team/issues/313
Added versions 8.19 and 9.1 to the table listing support for cross cluster search. The following screenshot gives a preview of the change.

Added the 'applies_to' tag to signify GA for 9.1.

[github-actions]

🔍 Preview links for changed docs

• solutions/search/cross-cluster-search.md

[eedugon]

Thanks for handling this!
We need to make some adjustments, let me know if you believe I've missed anything!

[leemthompo]

Thanks for jumping on this @ketkee-aryamane! First off, the table is awful to work with 🤣 and there's additional complexity because 8.18 wasn't 8.last.

Looking at the new table, it does look like we've introduced an error here: it now states that a local 9.0 is not compatible with a remote 8.18. This contradicts the explicit example text "For example, a local 9.0 cluster can search a remote 8.18 or any remote 9.x cluster. "

[eedugon]

There's still a pending change that I've added in a comment.

About the note I think we should update the link and not linking to the github page of Elasticsearch from our official docs. If feels really weird. But I'm not sure where to link at the moment.

[naj-h]

I left a comment on the missing references

[naj-h]

@ketkee-aryamane I think the table is missing some references. E.g. a local 8.19 is listed as incompatible with a remote on 9.1, 8.x would be compatible with a remote on 8.19.

[ketkee-aryamane]

hi @naj-h following is the updated table, where I do see that 8.19 is listed as compatible with a remote on 9.1, 8.x compatible with a remote on 8.19.

[naj-h]

We should remove local 9.0 with remote 8.19
There are some paths that appear are unsupported in the table, for which we're going to double-check, but this might be something we change in the doc in the future, even after the release is out, so i'm good with merging this table (after removing local 9.0 with remote 8.19)