300262 Remove the temp index from security_findings table

db/migrate/20210607080044_remove_temporary_index_on_security_findings_scan_id.rb

+# frozen_string_literal: true
+
+class RemoveTemporaryIndexOnSecurityFindingsScanId < ActiveRecord::Migration[6.1]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+  INDEX_NAME = 'tmp_index_on_security_findings_scan_id'
+
+  disable_ddl_transaction!
+
+  def up
+    remove_concurrent_index_by_name :security_findings, INDEX_NAME
+  end
+
+  def down
+    add_concurrent_index :security_findings, :scan_id, where: 'uuid is null', name: INDEX_NAME
+  end
+end

db/schema_migrations/20210607080044

+88f16dc06371d320a1245de68aba5ed4ad7cd8f15c4e5898619a751840981072
\ No newline at end of file

db/structure.sql

@@ -25075,8 +25075,6 @@ CREATE INDEX tmp_idx_deduplicate_vulnerability_occurrences ON vulnerability_occu
 
 CREATE INDEX tmp_idx_on_namespaces_delayed_project_removal ON namespaces USING btree (id) WHERE (delayed_project_removal = true);
 
-CREATE INDEX tmp_index_on_security_findings_scan_id ON security_findings USING btree (scan_id) WHERE (uuid IS NULL);
-
 CREATE INDEX tmp_index_on_vulnerabilities_non_dismissed ON vulnerabilities USING btree (id) WHERE (state <> 2);
 
 CREATE UNIQUE INDEX uniq_pkgs_deb_grp_architectures_on_distribution_id_and_name ON packages_debian_group_architectures USING btree (distribution_id, name);