Remove student searchbar caching from educator import job
Remove student searchbar caching from educator import job

+ Good catch from @jhilde: this isn't needed on every import since all the main educator users of the platform have had this data precomputed for them with a background job.
+ https://github.com/studentinsights/studentinsights/issues/993#issuecomment-329496753

studentinsights/studentinsights,studentinsights/studentinsights,studentinsights/studentinsights,studentinsights/studentinsights