scalable search service

[wkloucek]

Is your feature request related to a problem? Please describe.

The search service currently uses Bleve as search backend.

I want to start multiple search services:

• to serve more search requests
• to have high available search

But that is currently not possible because of Bleve

Describe the solution you'd like

Have a scaleable search.

Describe alternatives you've considered

Additional context

Maybe we should make our search itself stateless and leverage existing full-text engines like ElasticSearch / OpenSearch that already are scalable.

See also cs3org/reva#2970 (comment)

[micbar]

This would need a new backend implementation.

@fschade @rhafer @butonic We need to do some research what can be used as a scalable search backend.

[dragotin]

This is not yet actionable, and it would be good if the problems that can be seen on the platform would be described rather than putting technology recommendations in the focus.

Why can't the process not be scaled, what is the effect of that in the deployment etc? That would help to pinpoint a solution.

[wkloucek]

probably fixed by #11029