Added support for multiple cores.

[adrianschulz]

No description provided.

[tisto]

@adrianschulz could you elaborate your use case a bit more? Solr allows you to search across multiple cores, so you could move the abstraction to Solr level instead of Plone if I am not mistaken.

[adrianschulz]

@tisto Sure!

https://stackoverflow.com/questions/39450164/how-to-search-multiple-solr-core
Like you said it is possible to query across multiple cores with solr. But you have some limitations (strange scoring, evenly distribution necessary). Also you have exactly 1 result-set (results from both cores merged).
What we needed is a result-set per core (not merged!) because we want to display them as different result-sets. For this reason we need to be able to specify a core for each query. In my opinion this is clearly a thing for collective.solr. So I added arguments in some places which allows exactly what we wanted.

[tisto]

@adrianschulz thanks for the clarification. This makes sense. I just want to understand the use case, that's all. :)

Would it be possible to write a unit/integration test for this? Please also add a changelog entry.

[adrianschulz]

@tisto

Sure. But since I'm quite busy at the moment I will need some weeks for it (same for the other pull request).

[adrianschulz]

@tisto

I noticed that the development of this without breaking old collective.solr-setups is more difficult than I thought. So I think I need a lot longer than I planned.