How to use the hazelcast-client.EvictionPolicy.LFU function in hazelcast-client

* See the License for the specific language governing permissions and
 * limitations under the License.
 */

var Client = require('hazelcast-client').Client;
var Config = require('hazelcast-client').Config;
var EvictionPolicy = require('hazelcast-client').EvictionPolicy;

var nearCachedMapName = 'nearCachedMap';
var regularMapName = 'reqularMap';
var client;

var cfg = new Config.ClientConfig();
var nearCacheConfig = new Config.NearCacheConfig();
nearCacheConfig.name = nearCachedMapName;
nearCacheConfig.evictionPolicy = EvictionPolicy.LFU;
nearCacheConfig.invalidateOnChange = true;
cfg.nearCacheConfigs[nearCachedMapName] = nearCacheConfig;

function do50000Gets(client, mapName) {
    var timerStart;
    var timerEnd;
    var map;

    return client.getMap(mapName).then(function (mp) {
        map = mp;
        return map.put('item', 'anItem');
    }).then(function () {
        // warm up the cache
        return client.getMap(mapName);
    }).then(function (mp) {
        map = mp;