MongoDB shell helper for dropping a collection while keeping the indexes

collectionsafedropper.js

collectionsafedropper = function(database,col) {
    var thedb = db.getSiblingDB(database);
    var thecoll = thedb[col];
    var indexes = thecoll.getIndexes();
    print("Dropping: ", database.toString() + "." + col.toString());
    thecoll.drop();
    
    indexes.forEach(function(index) {
        var key = index.key;
        var options = {};
        if(index["sparse"] != null && index["sparse"] == true) {
            // Seems that the shell uses an integer value for sparse
            options.sparse=1;
        }
        if(index["unique"] != null && index["unique"] == true) {
            // Seems that the shell uses a boolean value for unique
            options.unique=true;
        }
        if(index["background"] != null && index["background"] == true) {
            // Seems that the shell uses an integer value for background
            options.background=1;
        }
        // TODO add more option checks here...
        
        print("Inserting Key:", JSON.stringify(key),"Options:", JSON.stringify(options));
        thedb[col].ensureIndex(key,options);
    });
}