code: public String removeAlias(String indice,String alias){
  		String removeAlias = new StringBuilder().append("{\"actions\": [{\"remove\": {\"index\":\"").append(indice).append("\",\"alias\": \"").append(alias).append("\"}}]}").toString();
  		return this.client.executeHttp("_aliases",removeAlias,ClientUtil.HTTP_POST);
  	}
docs: removing that same alias [alias] of [indice]
  more detail see :
  * https://www.elastic.co/guide/en/elasticsearch/reference/current/indices-aliases.html
  @param indice
  @param alias
  @return