Differences between LOOKUP Index and Enrich Index

[erikg]

Hello,

Elastic recently announced LOOKUP JOINS.
They specified that the lookup function in ES|QL only works if the index is a lookup index.
I am bit confused on this implementation? It seems like both ENRICH and LOOKUP JOIN are the same thing?

[dadoonet (David Pilato)]

It's super close. But you don't have anymore to run the enrich policy. It's automatically up to date.

[erikg]

Oh I see, I found this as well in the documentation just now:

Getting a bit complex but I think there's definitely benefits to introducing lookup index.