[BUG] Edismax search without boost number

[kylehuynh205]

What steps does it take to reproduce the issue?

• Visit Search API configuration https://sandbox.islandora.ca/admin/config/search/search-api/index/default_solr_index/fields, increasing boost number of field Description to 5.00 (as screenshot)

• Visit the Search page of Sandbox https://sandbox.islandora.ca/search
• (Optional) In Search view configuration https://sandbox.islandora.ca/admin/structure/views/view/solr_search_content/edit/page_1?destination=/search, Add field Solr score debugging (indexed field) in the Fields List

When does this issue occur?

• Search for "important" https://sandbox.islandora.ca/search?a%5B0%5D%5Bf%5D=all&a%5B0%5D%5Bi%5D=IS&a%5B0%5D%5Bv%5D=important
• Since the match of "important" in the Description field as 2nd priority - after the Title field (boost number is 5.00, and title's boost number is 8.00) but it's found in fifth place instead of the top of the results list.

Use case

• If we like to setup priority of fields while searching by assigning the boost number in a field as above, it doesn't reflect on the field list of edismax query at here
• if we log this line out, the list of fields which is going to be passed to edismax query : qf= (more on this at https://solr.apache.org/guide/solr/latest/query-guide/edismax-query-parser.html) will be:

score random boost_document ss_author ds_changed ds_created itm_edtf_year .....

• However, it should be include with boost number which is setup in https://sandbox.islandora.ca/admin/config/search/search-api/index/default_solr_index/fields for example:

ss_author^1 ds_changed^1 ds_created^1 itm_edtf_year^1 sm_field_award_received^1 tm_X3b_en_field_description^8

[kylehuynh205]

To solve this issue, I have a PR at #49