Merge branch 'issue_331828' into 'master'

Remove index_merge_requests_on_title index from merge_requests table

See merge request gitlab-org/gitlab!75823

db/migrate/20220111200254_remove_index_from_merge_requests.rb

+# frozen_string_literal: true
+
+class RemoveIndexFromMergeRequests < Gitlab::Database::Migration[1.0]
+  disable_ddl_transaction!
+
+  INDEX_NAME = 'index_merge_requests_on_title'
+
+  def up
+    remove_concurrent_index :merge_requests, :title, name: INDEX_NAME
+  end
+
+  def down
+    add_concurrent_index :merge_requests, :title, name: INDEX_NAME
+  end
+end

db/schema_migrations/20220111200254

+72c7e04b1a34154c894f93da800c15c717c3340d34729577538d539881d2e8ca
\ No newline at end of file

db/structure.sql

@@ -26683,8 +26683,6 @@ CREATE INDEX index_merge_requests_on_target_project_id_and_updated_at_and_id ON
 
 CREATE INDEX index_merge_requests_on_target_project_id_iid_jira_description ON merge_requests USING btree (target_project_id, iid) WHERE (description ~ '[A-Z][A-Z_0-9]+-\d+'::text);
 
-CREATE INDEX index_merge_requests_on_title ON merge_requests USING btree (title);
-
 CREATE INDEX index_merge_requests_on_title_trigram ON merge_requests USING gin (title gin_trgm_ops);
 
 CREATE INDEX index_merge_requests_on_tp_id_and_merge_commit_sha_and_id ON merge_requests USING btree (target_project_id, merge_commit_sha, id);