ES 8.x.0 support

[dweiss]

From the first quick look, it's going to be a large one again. I'll wait for the final version and then upgrade what's needed.

[foboni]

@dweiss any update on ES 8.x support ?

[dweiss]

Sure, it's just not of so high priority. I'll add it to the list of things to do after vacation.

[foboni]

@dweiss Can we apply a small patch to support es 8 ? or do we need to migrate to their new java client ?

[dweiss]

I've no idea how invasive it'll be, to be honest... I have not tracked the changes in es8. I do have it on my todo list but there's always something preempting it...

[foboni]

@dweiss Most es plugins are yet to get a release for 8.x versions. Only a few like elasticsearch-ingest-langdetect has 8.x release.

[dweiss]

So... I did try to upgrade to ES 8.5.0 and I honestly don't see a way forward... I can't get the tests to run and I don't think those hacks we used in the past are passible (reusing the internal search request) because of the modularization. I can get the code to compile but it no longer works at runtime (and I can't get the local tests to run either).

I'm seriously contemplating terminating the plugin altogether. One can run clustering as a mash-up service on top of ES and the close integration with ES internals we've had in the past is something we simply can't keep up with.