feat: Add option keepUnknownIndexes to retain indexes which are not specified in schema (#9857)

src/Options/Definitions.js

@@ -28,6 +28,13 @@ module.exports.SchemaOptions = {
     action: parsers.booleanParser,
     default: false,
   },
+  keepUnknownIndexes: {
+    env: 'PARSE_SERVER_SCHEMA_KEEP_UNKNOWN_INDEXES',
+    help:
+      "(Optional) Keep indexes that are present in the database but not defined in the schema. Set this to `true` if you are adding indexes manually, so that they won't be removed when running schema migration. Default is `false`.",
+    action: parsers.booleanParser,
+    default: false,
+  },
   lockSchemas: {
     env: 'PARSE_SERVER_SCHEMA_LOCK_SCHEMAS',
     help:

src/Options/docs.js

@@ -4,6 +4,7 @@
  * @property {Function} beforeMigration Execute a callback before running schema migrations.
  * @property {Any} definitions Rest representation on Parse.Schema https://docs.parseplatform.org/rest/guide/#adding-a-schema
  * @property {Boolean} deleteExtraFields Is true if Parse Server should delete any fields not defined in a schema definition. This should only be used during development.
+ * @property {Boolean} keepUnknownIndexes (Optional) Keep indexes that are present in the database but not defined in the schema. Set this to `true` if you are adding indexes manually, so that they won't be removed when running schema migration. Default is `false`.
  * @property {Boolean} lockSchemas Is true if Parse Server will reject any attempts to modify the schema while the server is running.
  * @property {Boolean} recreateModifiedFields Is true if Parse Server should recreate any fields that are different between the current database schema and theschema definition. This should only be used during development.
  * @property {Boolean} strict Is true if Parse Server should exit if schema update fail.

src/Options/index.js

@@ -25,6 +25,9 @@ export interface SchemaOptions {
   /* Is true if Parse Server will reject any attempts to modify the schema while the server is running.
   :DEFAULT: false */
   lockSchemas: ?boolean;
+  /* (Optional) Keep indexes that are present in the database but not defined in the schema. Set this to `true` if you are adding indexes manually, so that they won't be removed when running schema migration. Default is `false`.
+  :DEFAULT: false */
+  keepUnknownIndexes: ?boolean;
   /* Execute a callback before running schema migrations. */
   beforeMigration: ?() => void | Promise<void>;
   /* Execute a callback after running schema migrations. */