Commits on May 9, 2024

1. Disable Learning to Rank's involvement in queries …

   Learning to Rank only changes the ordering of results when the query includes
   keywords and is ordered by relevance.
   
   It can only affect how results rank within a single page. The maximum effect it
   could have is to reverse the order of a page of results. The results all still
   appear on the same page.
   
   Site search searches with keywords (the majority of searches) are now served by
   Vertex AI search. The cost and complexity of running a Learning to Rank training
   and serving pipeline for the other use cases no longer seems commensurate
   with the impact.
   
   In addition to this, the training of our model has not been supervised
   effectively for a while, leading to a drop in the quality of the model.
   
   I therefore propose disabling the use of Learning to Rank in Search-API
   (this change) which allows the removal of the code to invoke the model, the
   pipeline that builds and deploys the model and the Terraform to support the
   deployment.

   

   sihugh committed May 9, 2024
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