Opensearch model updates to index fields for subject ui filter and sort

[stuart-mindt]

Description of change

Opensearch model updates to index fields for activity page interaction subject filtering and sorting

https://uktrade.atlassian.net/browse/CLS2-76

Checklist

• Has this branch been rebased on top of the current main branch?

  Explanation

  The branch should not be stale or have conflicts at the time reviews are requested.

• Is the CircleCI build passing?

General points

Other things to check

• Make sure fixtures/test_data.yaml is maintained when updating models
• Consider the admin site when making changes to models
• Use select-/prefetch-related field lists in views and search apps, and update them when fields are added
• Make sure the README is updated e.g. when adding new environment variables

See docs/CONTRIBUTING.md for more guidelines.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 96.65%. Comparing base (ce7c202) to head (dfee6fd).
Report is 25 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #5945   +/-   ##
=======================================
  Coverage   96.65%   96.65%           
=======================================
  Files        1070     1070           
  Lines       25262    25263    +1     
  Branches     1664     1664           
=======================================
+ Hits        24416    24417    +1     
  Misses        690      690           
  Partials      156      156           

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