Remove index for security_findings on scan_id

db/migrate/20200914184212_remove_index_on_security_findings_scan_id.rb

+# frozen_string_literal: true
+
+class RemoveIndexOnSecurityFindingsScanId < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+  INDEX_NAME = 'index_security_findings_on_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, name: INDEX_NAME
+  end
+end

db/schema_migrations/20200914184212

+dcfd1f006aa6695e0fd8f392c7288f2d80bddfe53827d3a2f079bd039f4fe0de
\ No newline at end of file

db/structure.sql

@@ -20958,8 +20958,6 @@ CREATE INDEX index_security_findings_on_confidence ON public.security_findings U
 
 CREATE INDEX index_security_findings_on_project_fingerprint ON public.security_findings USING btree (project_fingerprint);
 
-CREATE INDEX index_security_findings_on_scan_id ON public.security_findings USING btree (scan_id);
-
 CREATE INDEX index_security_findings_on_scan_id_and_deduplicated ON public.security_findings USING btree (scan_id, deduplicated);
 
 CREATE INDEX index_security_findings_on_scanner_id ON public.security_findings USING btree (scanner_id);