A script to print out all the indexes in all database of mongo

get_all_database_indexes_from_mongo.js

var db = db.getSiblingDB("admin");
var dbs = db.runCommand({ "listDatabases": 1 }).databases.sort();
dbs.forEach(function(database) {
    db = db.getSiblingDB(database.name);
    cols = db.getCollectionNames().sort();
    cols.forEach(function(col) {
    if (!db[col]) { return; }
      db[col].getIndexes().sort().forEach(function(index) {
      if ("_id_" !== index.name) {
          print("at database: [" + database.name +"], db." + col + ".ensureIndex(" + tojson(index.key) + ")");
         }
      });
     });
  });