mongoDB indexes migration

db.your_collection.getIndexes();

var collectionList = db.getCollectionNames();
// var collectionList = ["foo","bar"]
for (var index in collectionList) {
  var collection = collectionList[index];
  var cur = db.getCollection(collection).getIndexes();
  if (cur.length == 1) {
    continue;
  }
  for (var index1 in cur) {
    var next = cur[index1];
    if (next["name"] == "_id_") {
      continue;
    }
    var unique = next["unique"] ? true : false;
    print(
      'db.getCollection("' +
        collection +
        '").createIndex(' +
        JSON.stringify(next["key"]) +
        ",{unique:" +
        unique +
        "},{background:1});"
    );
  }
}

mongosh --quiet 'mongodb://$user:$passwd@$host:$port/$db?ssl=false&authSource=admin' /tmp/script.js > /tmp/result.txt

db.getCollection("foo").createIndex({"created_time":1,"contract":1,"symbol":1},{unique:false},{background:1});
db.getCollection("foo").createIndex({"contract":1,"symbol":1},{unique:false},{background:1});
db.getCollection("foo").createIndex({"created_time":1},{unique:false},{background:1});