full-elastic-stack-example vector use datastream

[fjellvannet]

Updating the vector config to generate a datastream rather than an index - this works better for production. Also sets the data_stream fields accordingly

Just double-checked that this works twice (both with the namespace and elasticsearch rename from the last PR just to be double sure that it works)

For now this is my last PR :)

[RichardoC]

For this one, I think it's better not to include this in the example as often the ES datastreams are set up via the elastic cluster rather than the api clients https://www.elastic.co/guide/en/elasticsearch/reference/current/data-streams.html and I'm trying to keep this example simple for folks to see what's going on rather than have something production ready. At that point we should probably be adding lifecycle management etc as well 😅

Thank you though

[fjellvannet]

That's alright :) This is why I made three separate PR's :)

Maybe it could be included in another example or in a comment or something?

[RichardoC]

Makes sense, I'm happy to link to an "Elastic best practises" document from this example's README which says use datastreams/retentions/don't have excessive fields/etc if you have a recommendation?