add migration file for dropping indices

src/migrations/20191102223900-drop-configs-indices.js

@@ -0,0 +1,22 @@
+require('module-alias/register');
+const logger = require('@alias/logger')('growi:migrate:drop-configs-indices');
+
+const mongoose = require('mongoose');
+const config = require('@root/config/migrate');
+
+module.exports = {
+  async up(db) {
+    logger.info('Apply migration');
+    mongoose.connect(config.mongoUri, config.mongodb.options);
+
+    const collection = db.collection('configs');
+    await collection.dropIndex('ns_1');
+    await collection.dropIndex('key_1');
+
+    logger.info('Migration has successfully applied');
+  },
+
+  down(db) {
+    // do not rollback
+  },
+};

src/migrations/20191102223901-drop-pages-indices.js

@@ -0,0 +1,23 @@
+require('module-alias/register');
+const logger = require('@alias/logger')('growi:migrate:drop-pages-indices');
+
+const mongoose = require('mongoose');
+const config = require('@root/config/migrate');
+
+module.exports = {
+  async up(db) {
+    logger.info('Apply migration');
+    mongoose.connect(config.mongoUri, config.mongodb.options);
+
+    const collection = db.collection('pages');
+    await collection.dropIndex('lastUpdateUser_1');
+    await collection.dropIndex('liker_1');
+    await collection.dropIndex('seenUsers_1');
+
+    logger.info('Migration has successfully applied');
+  },
+
+  down(db) {
+    // do not rollback
+  },
+};