Remove `bulk_import_batch_trackers` index

This is a duplicated index.

Changelog: performance

db/post_migrate/20231122124815_drop_index_bulk_import_batch_trackers_on_tracker_id.rb

+# frozen_string_literal: true
+
+class DropIndexBulkImportBatchTrackersOnTrackerId < Gitlab::Database::Migration[2.2]
+  disable_ddl_transaction!
+
+  milestone '16.7'
+
+  INDEX_NAME = :index_bulk_import_batch_trackers_on_tracker_id
+  TABLE_NAME = :bulk_import_batch_trackers
+
+  def up
+    remove_concurrent_index_by_name TABLE_NAME, INDEX_NAME
+  end
+
+  def down
+    add_concurrent_index TABLE_NAME, :tracker_id, name: INDEX_NAME
+  end
+end

db/schema_migrations/20231122124815

+ee23092caa9be8dc1f4931f0157897c1219bc4326d7de090026439996ea0cdaf
\ No newline at end of file

db/structure.sql

@@ -31821,8 +31821,6 @@ CREATE INDEX index_boards_on_project_id ON boards USING btree (project_id);
 CREATE INDEX index_broadcast_message_on_ends_at_and_broadcast_type_and_id ON broadcast_messages USING btree (ends_at, broadcast_type, id);
-CREATE INDEX index_bulk_import_batch_trackers_on_tracker_id ON bulk_import_batch_trackers USING btree (tracker_id);
-
 CREATE INDEX index_bulk_import_configurations_on_bulk_import_id ON bulk_import_configurations USING btree (bulk_import_id);
 CREATE INDEX index_bulk_import_entities_on_bulk_import_id_and_status ON bulk_import_entities USING btree (bulk_import_id, status);

spec/support/helpers/database/duplicate_indexes.yml

@@ -27,9 +27,6 @@ boards_epic_board_recent_visits:
 boards_epic_user_preferences:
   index_boards_epic_user_preferences_on_board_user_epic_unique:
     - index_boards_epic_user_preferences_on_board_id
-bulk_import_batch_trackers:
-  i_bulk_import_trackers_id_batch_number:
-    - index_bulk_import_batch_trackers_on_tracker_id
 bulk_import_export_batches:
   i_bulk_import_export_batches_id_batch_number:
     - index_bulk_import_export_batches_on_export_id