printAllIndexes.js

// Print index details
print(["Namespace", "Index Name", "Index Size", "Index Keys", "Usage Count", "Last Used"].join('\t'));
db.getMongo().getDBNames().forEach(function (dbname) {
    db.getSiblingDB(dbname).getCollectionNames().forEach(function (cname) {
        var coll = db.getSiblingDB(dbname).getCollection(cname);
        var stats = coll.stats();
        coll.aggregate([ { $indexStats: {} } ]).forEach(function(ix) {
            var ixname = ix.name;
            var ns = dbname + "." + cname;
            var ixsize = stats.indexSizes[ixname];
            var ops = ix.accesses.ops;
            var since = ix.accesses.since;
            print([ns, ixname, ixsize, JSON.stringify(ix.key), ops, since].join('\t'));
        });
    });
});