Feature/solr upgrade

[anusharanganathan]

Added a new container for solr9. When testing is successful, we can delete solr (=solr6)

[anusharanganathan]

Status as of commit Updates to solr9 schema and config

What works

• There is a n new container for Solr9 in docker compose.
• Change the SOLR_URL in the .env file to point to the SOLR you want. Both web and indexer use this .env file.

  # For SOLR 6, use hostname=solr
  SOLR_URL=http://solr:8983/solr/
  
  # For SOLR 9, use hostname=solr9
  SOLR_URL=http://solr9:8983/solr/
  

• To index the data in solr 9, the steps ae the same as indexing the data in Solr 6. Instructions to use the indexer are in the Indexer/Readme
• Able to index data in Solr 9 without any errors
• All of the pages work in the UI

Issues to be addressed

• The results in search and browse are not consistent with Solr 6
  • The results from search are much lower than with Solr 6 (for example people = Abbot produces 63 results with Solr 6 and 36 results with Solr 9)
  • The results for browse includes names that do not start with a for example

Points to note

• The browse field type was changed to text_gen_sort from AlphaOnlySort because of an error during indexing (in commit 6002d31). Look at AlphaOnlySort. Perhaps we need the tokeniser.
• Added the default search field default_search_field to solrconfig. See diff for example. Maybe this should be added only to select, query and spell and not update
• Do we need to update the stop words and other similar settings?