Remove the old fulltext indexes

We only search by account_key, content, and title now.

db/migrate/20251121112416_remove_old_fulltext_indexes_from_search_records.rb

@@ -0,0 +1,16 @@
+class RemoveOldFulltextIndexesFromSearchRecords < ActiveRecord::Migration[8.2]
+  def up
+    # Remove the old fulltext indexes (content, title) from all 16 search_records shards
+    # We're keeping the new indexes (account_key, content, title) for tenant-aware searching
+    (0..15).each do |shard|
+      remove_index "search_records_#{shard}", name: "index_search_records_#{shard}_on_content_and_title"
+    end
+  end
+
+  def down
+    # Re-create the old fulltext indexes in case we need to rollback
+    (0..15).each do |shard|
+      add_index "search_records_#{shard}", [ :content, :title ], type: :fulltext, name: "index_search_records_#{shard}_on_content_and_title"
+    end
+  end
+end