[Issue]: Information about new lookup indexes is missing in the Manage data area

[rayafratkina]

Type of issue

Missing information

What documentation page is affected

https://www.elastic.co/docs/manage-data/data-store/index-basics

What happened?

I was trying to find information about new lookup indexes, but there is nothing about them in "Manage data" area
There is some information about using lookup indexes in Reference.

We should mention Lookup joins and have some information about creating them

Additional info

No response

[leemthompo]

@rayafratkina there's info here in the Elasticsearch reference, which is also cross-linked from the LOOKUP JOIN docs:

https://www.elastic.co/docs/reference/elasticsearch/index-settings/index-modules#index-mode-setting

Let me know where you expected to find this exactly and if there's additional info you'd like to see documented.

cc @bpintea for ESQL visibility