Christoph Büscher 8ba771e913 Rank Eval: Handle exceptions on search requests and add them to response
Currently we fail the whole ranking evaluation request when we receive an
exception for any of the search requests. We should collect those errors and
report them back to the user in the rest response. This change adds collecting
the errors and propagating them back via the RankEvalResponse.

Closes #19889
2016-11-24 13:52:10 +01:00
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