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Adjust rescoring methods to be able to optionally use additional fields for scoring information
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Description

The current rescoring method is the same for all indices, which is convenient but isn't going to work with our plans to integrate page rank and page view data into scoring. The rescore's need to be refactored so this can be turned on/off with some configuration.

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EBernhardson assigned this task to dcausse.
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Change 249460 had a related patch set uploaded (by DCausse):
[WIP] Allow customization of rescore queries

https://gerrit.wikimedia.org/r/249460

I think we will have to add a task to adjust the weights, I don't have any good methods except using the hypothesis cluster with large wikis and &cirrusExplain.
A set of ambiguous queries where pageviews makes sense would be very welcome.

Change 249460 merged by jenkins-bot:
Allow customization of rescore queries

https://gerrit.wikimedia.org/r/249460