private void createAlias(final int jettyPort, final String aliasName, final String aliasedCollections) throws IOException {
    final String url = "http://localhost:"
            + jettyPort
            + "/solr/admin/collections?action=CREATEALIAS"
            + "&name=" + aliasName
            + "&collections=" + aliasedCollections;

    final HttpGet request = new HttpGet(url);

    try (final CloseableHttpClient client = HttpClientBuilder.create().build();
            final CloseableHttpResponse response = client.execute(request)) {
        final HttpEntity entity = response.getEntity();

        System.out.println(IOUtils.toString(entity.getContent(), "UTF-8"));

        // close the content stream.
        EntityUtils.consumeQuietly(entity);
    }
}

private void deleteAlias(final int jettyPort, final String aliasName) throws IOException {
    final String url = "http://localhost:"
            + jettyPort
            + "/solr/admin/collections?action=DELETEALIAS"
            + "&name=" + aliasName;

    final HttpGet request = new HttpGet(url);

    try (final CloseableHttpClient client = HttpClientBuilder.create().build();
            final CloseableHttpResponse response = client.execute(request)) {
        final HttpEntity entity = response.getEntity();

        System.out.println(IOUtils.toString(entity.getContent(), "UTF-8"));

        // close the content stream.
        EntityUtils.consumeQuietly(entity);
    }
}