[backend] add doc code in error

opencti-platform/opencti-graphql/src/modules/indicator/indicator-domain.ts

@@ -229,6 +229,7 @@ const validateIndicatorPattern = async (context: AuthContext, user: AuthUser, pa
       const exclusionListCheck = await checkObservableValue(observableValues[i]);
       if (exclusionListCheck) {
         throw FunctionalError(`Indicator of type ${patternType} is contained in exclusion list.`, {
+          doc_code: 'INDICATOR_FORMAT_EXCLUDED',
           excludedValue: exclusionListCheck.value,
           exclusionList: exclusionListCheck.listId
         });