var client = getInstance( "Client@cbElasticsearch" );
var aliasBuilder = getInstance( "AliasBuilder@cbElasticSearch" );
// "pour" book documents into new library index
client.reindex( "books", "library" );
// create an alias of the old index name so no code errors out
client.applyAliases(
aliasBuilder.add( "library", "books" )
);