sort by score doesn't seem to work && Add `_score`, `max_score` in the response

[nbittich]

it would be very handy to have information about the search results from elastic in the response (e.g in the meta object or something like this).

In this example, we would need the max_score to show it as the first row, then order the other hits by the _score (desc):

also, I've tried to sort data based on the score (sort[:avg:score]=desc) and that doesn't seem to work.

[nvdk]

I think sorting on avg score doesn't make much sense and I wonder where the example in the readme is coming for. I think sort[_score]=desc should work though, so perhaps we should just update the readme for that?

Including _score and max_score makes sense, I think we just need to add track_scoring when sorting is enabled. See also https://www.elastic.co/guide/en/elasticsearch/reference/current/sort-search-results.html#_track_scores

[nbittich]

In the case described in the design above, we search over positions based on the person's firstname and/or lastname, and then we group these positions in the frontend based on the person's id linked to it. a person can have multiple position.
Since we group them in a map of person=>positions in the frontend, we lose the sorting and thus, if we had the score, it would be much easier to sort them back in the frontend.

Let me know if it's unclear. A possible workaround would be to index the person, search on the persons, then search again on the position, and somehow merge both in the grouping i mentioned before. but this seem a bit more work for the frontend & more data to index / keep in sync