Blacklight unstemmed_overrides, with relevant solrconfig.xml

gistfile1.rb

# These are over-rides sent to Solr when in :unstemmed_search mode
# They need to be kind of carefully calibrated with the settings in Solr
# and Blacklight for individual search types, sorry it's a bit fragile. 

config[:unstemmed_overrides] = {
    "title_qf" => [
      "title1_unstem^80",
      "title2_unstem^60",
      "title3_unstem^30",
      "title_series_unstem^25"
    ],
    "subject_qf" => "subject_unstem^40",
    "series_qf" => "title_series_unstem^10",
    # this 'qf' will be used for default 'all fields' search
    # when in unstemmed mode, over-riding the qf defaults set
    # in solrconfig.xml, which include some stemmed fields. 
    "qf" => [
        'title1_unstem^80',
        'title2_unstem^60',
        'title3_unstem^20',
        'author_unstem^90',
        'author2_unstem^40',
        'subject_unstem^20',
        'title_series_unstem^10',
        'isbn_t',
        'issn',
        'issn_related',
        'local_call_number_t',
        'oclcnum_t',
        'lccn',
        'text_unstem^2',
        'text_extra_boost_unstem^6'        
    ]
  }

gistfile2.xml

  <requestHandler name="search" class="solr.SearchHandler" default="true" >
    <lst name="defaults">
      <str name="defType">dismax</str>
      <str name="echoParams">explicit</str>      
      <str name="q.alt">*:*</str>
      <str name="mm">3&lt;-1 6&lt;80%</str>
      <str name="qf">
        title1_unstem^80
        title2_unstem^60
        title3_unstem^20

        title1_t^30
        title2_t^25
        title3_t^10

        author_unstem^90
        author2_unstem^40

        subject_unstem^20
        subject_t^10

        title_series_unstem^10
        title_series_t^5

        isbn_t
        issn
        issn_related
        local_call_number_t
        oclcnum_t
        lccn

        text
        text_unstem^2
        text_extra_boost_t^4
        text_extra_boost_unstem^6
      </str>

   <!-- ...ommitted irrelevant parts... -->


      <!-- Blacklight-search specific values, will be used as Solr LocalParams -->
      <str name="title_qf">
        title1_unstem^80
        title2_unstem^60
        title3_unstem^30

        title1_t^30
        title2_t^25
        title3_t^10
        
        title_series_unstem^25
        title_series_t^10
      </str>
      <str name="title_pf">
        title_exactmatch^500 

        title1_unstem^320
        title2_unstem^240
        title3_unstem^160

        title_series_unstem^120

        title1_t^60
        title2_t^50
        title3_t^20  
        title_series_t^30             
      </str>
      
      <str name="series_qf">
        title_series_unstem^10
        title_series_t
      </str>
      <str name="series_pf">
        title_series_unstem^100
        title_series_t^20
      </str>
      
      <str name="author_qf">
        author_unstem^80
        author2_unstem^40
      </str>
      <str name="author_pf">
        author_unstem^400
        author2_unstem^240
      </str>
      
      <str name="subject_qf">
        subject_unstem^40
        subject_t^15
      </str>
      <str name="subject_pf">
        subject_unstem^120
        subject_t^30  
      </str>
      
      <str name="numbers_qf">
        isbn_t^10
        issn^10
        oclcnum_t^10
        lccn^10
        local_call_number_t^10
        
        issn_related^5
        
        other_number_unstem        
      </str>
      <str name="numbers_pf">
        local_call_number_t^50
        other_number_unstem^10
        lccn^10        
      </str>
      
      
    </lst>
    <arr name="last-components">
      <str>spellcheck</str>
    </arr>
  </requestHandler>