allowCompression parameter not been used

<shardHandlerFactory name="shardHandlerFactory"
    class="HttpShardHandlerFactory">
    <int name="socketTimeout">${socketTimeout:600000}</int>
    <int name="connTimeout">${connTimeout:60000}</int>
    <bool name="useRetries">true</bool>
    <bool name="allowCompression">true</bool>
  </shardHandlerFactory>

ModifiableSolrParams clientParams = new ModifiableSolrParams();
    clientParams.set(HttpClientUtil.PROP_MAX_CONNECTIONS_PER_HOST, maxConnectionsPerHost);
    clientParams.set(HttpClientUtil.PROP_MAX_CONNECTIONS, maxConnections);
    clientParams.set(HttpClientUtil.PROP_SO_TIMEOUT, soTimeout);
    clientParams.set(HttpClientUtil.PROP_CONNECTION_TIMEOUT, connectionTimeout);
    if (!useRetries) {
      clientParams.set(HttpClientUtil.PROP_USE_RETRY, false);
    }
    this.defaultClient = HttpClientUtil.createClient(clientParams);
    
    // must come after createClient
    if (useRetries) {
      // our default retry handler will never retry on IOException if the request has been sent already,
      // but for these read only requests we can use the standard DefaultHttpRequestRetryHandler rules
      ((DefaultHttpClient) this.defaultClient).setHttpRequestRetryHandler(new DefaultHttpRequestRetryHandler());
    }

<requestParsers enableRemoteStreaming="false" 
                    multipartUploadLimitInKB="2048000"
                    formdataUploadLimitInKB="2048"
                    addHttpRequestToContext="false"/>